diff --git a/typescript/client/src/components/tables/seeds/SeedsBMSCourseLookupTable.tsx b/typescript/client/src/components/tables/seeds/SeedsBMSCourseLookupTable.tsx
index 14f0a7039..cb1deb593 100644
--- a/typescript/client/src/components/tables/seeds/SeedsBMSCourseLookupTable.tsx
+++ b/typescript/client/src/components/tables/seeds/SeedsBMSCourseLookupTable.tsx
@@ -2,7 +2,12 @@ import { type BMSCourseWithRelated, type CellsRenderFN } from "#types/seeds";
 import { StrSOV } from "#util/sorts";
 import { type SearchFunctions } from "#util/ztable/search";
 import React from "react";
-import { FormatChart, GetBMSCourseIndex } from "tachi-common";
+import {
+	type ChartDocument,
+	type ChartDocumentData,
+	FormatChart,
+	GetBMSCourseIndex,
+} from "tachi-common";
 
 import { type Header } from "../components/TachiTable";
 
@@ -40,7 +45,7 @@ export const SeedsBMSCourseLookupSearchFns: SearchFunctions<BMSCourseWithRelated
 					return `UNKNOWN CHART (${e})`;
 				}
 
-				return FormatChart(e.chart);
+				return FormatChart({ ...e.chart, song: e.song } as unknown as ChartDocument);
 			})
 			.join("\n"),
 };
@@ -59,12 +64,17 @@ export const SeedsBMSCourseLookupCells: CellsRenderFN<BMSCourseWithRelated> = ({
 					{typeof e === "string" ? (
 						<span className="text-danger">UNKNOWN CHART</span>
 					) : (
-						<span>{FormatChart(e.chart)} </span>
+						<span>{FormatChart({ ...e.chart, song: e.song } as unknown as ChartDocument)} </span>
 					)}
 
 					{!compress && (
 						<div className="ms-auto" key={i}>
-							<code>{typeof e === "string" ? e : e.chart.data.hashMD5}</code>
+							<code>
+								{typeof e === "string"
+									? e
+									: (e.chart.data as ChartDocumentData["bms-7k"] | ChartDocumentData["bms-14k"])
+											.hashMD5}
+							</code>
 						</div>
 					)}
 				</div>
diff --git a/typescript/client/src/components/tables/seeds/SeedsChartsTable.tsx b/typescript/client/src/components/tables/seeds/SeedsChartsTable.tsx
index 95d792005..ce88afe63 100644
--- a/typescript/client/src/components/tables/seeds/SeedsChartsTable.tsx
+++ b/typescript/client/src/components/tables/seeds/SeedsChartsTable.tsx
@@ -6,7 +6,7 @@ import { FlattenValue, StringifyKeyChain } from "#util/misc";
 import { StrSOV } from "#util/sorts";
 import { type SearchFunctions } from "#util/ztable/search";
 import React from "react";
-import { COLOUR_SET, type V3Game } from "tachi-common";
+import { type ChartDocument, COLOUR_SET, type V3Game } from "tachi-common";
 
 import DifficultyCell from "../cells/DifficultyCell";
 import ObjCell from "../cells/ObjCell";
@@ -21,7 +21,7 @@ export function MakeSeedsChartsControls(game: V3Game): {
 } {
 	return {
 		headers: [
-			ChartHeader(game, (k) => k),
+			ChartHeader(game, (k) => k as unknown as ChartDocument),
 			["Title", "Title", StrSOV((x) => x.__related.song?.title ?? "")],
 			["Data", "Data"],
 		],
@@ -31,7 +31,7 @@ export function MakeSeedsChartsControls(game: V3Game): {
 			songID: (x) => x.__related.song?.id ?? null,
 			searchTerms: (x) => x.__related.song?.searchTerms.join(", ") ?? null,
 			altTitles: (x) => x.__related.song?.altTitles.join(", ") ?? null,
-			difficulty: (x) => x.difficulty,
+			difficulty: (x) => String(x.difficulty),
 			level: (x) => x.levelNum,
 			data: (x) =>
 				FlattenValue(x.data)
@@ -40,14 +40,14 @@ export function MakeSeedsChartsControls(game: V3Game): {
 		},
 		Cells: ({ data }) => (
 			<>
-				<DifficultyCell chart={data} game={game} />
+				<DifficultyCell chart={data as unknown as ChartDocument} game={game} />
 
 				{/* if we have a song, render the title cell. Otherwise, this chart has no parent song, and is invalid. */}
 				{data.__related.song ? (
-					<TitleCell chart={data} game={game} song={data.__related.song} />
+					<TitleCell chart={data as unknown as ChartDocument} game={game} song={data.__related.song} />
 				) : (
 					<td style={{ backgroundColor: ChangeOpacity(COLOUR_SET.red, 0.3) }}>
-						INVALID SONG ({data.song.id})
+						INVALID SONG ({data.songID})
 						<QuickTooltip tooltipContent="This chart points to a songID that does not exist at the time of this commit. This is a fatal error, and this commit doesn't pass tests.">
 							<div>
 								<Icon type="info" />
diff --git a/typescript/client/src/components/tables/seeds/SeedsQuestTable.tsx b/typescript/client/src/components/tables/seeds/SeedsQuestTable.tsx
index 2563d18da..8b8057f58 100644
--- a/typescript/client/src/components/tables/seeds/SeedsQuestTable.tsx
+++ b/typescript/client/src/components/tables/seeds/SeedsQuestTable.tsx
@@ -4,7 +4,12 @@ import { type CellsRenderFN, type QuestWithRelated } from "#types/seeds";
 import { StrSOV } from "#util/sorts";
 import { type SearchFunctions } from "#util/ztable/search";
 import React from "react";
-import { FormatGame } from "tachi-common";
+import {
+	type GameGroup,
+	type GoalDocument,
+	LEGACY_FormatGameGroupPT,
+	type LEGACY_Playtypes,
+} from "tachi-common";
 
 import { type Header } from "../components/TachiTable";
 
@@ -19,7 +24,11 @@ export const SeedsQuestSearchFns: SearchFunctions<QuestWithRelated> = {
 	name: (x) => x.name,
 	questID: (x) => x.questID,
 	game: (x) => x.game,
-	gpt: (x) => FormatGame(x.game),
+	gpt: (x) =>
+		LEGACY_FormatGameGroupPT(
+			x.game as GameGroup,
+			x.playtype as LEGACY_Playtypes[typeof x.game],
+		),
 	goals: (x) =>
 		Object.values(x.__related.goals)
 			.map((e) => e!.name)
@@ -38,7 +47,12 @@ export const SeedsQuestCells: CellsRenderFN<QuestWithRelated> = ({
 		<td>
 			<strong>{data.name}</strong>
 		</td>
-		<td>{FormatGame(data.game)}</td>
+		<td>
+			{LEGACY_FormatGameGroupPT(
+				data.game as GameGroup,
+				data.playtype as LEGACY_Playtypes[typeof data.game],
+			)}
+		</td>
 		<td>
 			<div style={{ maxHeight: "200px", overflowY: "auto" }}>
 				{data.questData.map((section) => (
@@ -51,7 +65,7 @@ export const SeedsQuestCells: CellsRenderFN<QuestWithRelated> = ({
 							if (goal) {
 								return (
 									<div className="text-start" key={ref.goalID}>
-										<InnerQuestSectionGoal goal={goal} />
+										<InnerQuestSectionGoal goal={goal as GoalDocument} />
 										{ref.note && <Muted>{ref.note}</Muted>}
 									</div>
 								);
diff --git a/typescript/client/src/components/tables/seeds/SeedsQuestlineTable.tsx b/typescript/client/src/components/tables/seeds/SeedsQuestlineTable.tsx
index 3f9f4223b..b76da2ad5 100644
--- a/typescript/client/src/components/tables/seeds/SeedsQuestlineTable.tsx
+++ b/typescript/client/src/components/tables/seeds/SeedsQuestlineTable.tsx
@@ -3,7 +3,11 @@ import { type CellsRenderFN, type QuestlineWithRelated } from "#types/seeds";
 import { StrSOV } from "#util/sorts";
 import { type SearchFunctions } from "#util/ztable/search";
 import React from "react";
-import { FormatGame } from "tachi-common";
+import {
+	type GameGroup,
+	LEGACY_FormatGameGroupPT,
+	type LEGACY_Playtypes,
+} from "tachi-common";
 
 import { type Header } from "../components/TachiTable";
 
@@ -19,7 +23,11 @@ export const SeedsQuestlineSearchFns: SearchFunctions<QuestlineWithRelated> = {
 	questlineID: (x) => x.questlineID,
 	desc: (x) => x.desc,
 	game: (x) => x.game,
-	gpt: (x) => FormatGame(x.game),
+	gpt: (x) =>
+		LEGACY_FormatGameGroupPT(
+			x.game as GameGroup,
+			x.playtype as LEGACY_Playtypes[typeof x.game],
+		),
 	quests: (x) =>
 		Object.values(x.__related.quests)
 			.filter((e) => e !== undefined)
@@ -37,7 +45,12 @@ export const SeedsQuestlineCells: CellsRenderFN<QuestlineWithRelated> = ({ data
 			<br />
 			<Muted>{data.desc}</Muted>
 		</td>
-		<td>{FormatGame(data.game)}</td>
+		<td>
+			{LEGACY_FormatGameGroupPT(
+				data.game as GameGroup,
+				data.playtype as LEGACY_Playtypes[typeof data.game],
+			)}
+		</td>
 		<td className="text-start">
 			<div style={{ maxHeight: "200px", overflowY: "auto" }}>
 				{data.quests.map((e) => {
@@ -47,7 +60,12 @@ export const SeedsQuestlineCells: CellsRenderFN<QuestlineWithRelated> = ({ data
 						<div key={e}>
 							{quest ? (
 								<span>
-									{quest.name} ({FormatGame(quest.game)})
+									{quest.name} (
+									{LEGACY_FormatGameGroupPT(
+										quest.game as GameGroup,
+										quest.playtype as LEGACY_Playtypes[typeof quest.game],
+									)}
+									)
 								</span>
 							) : (
 								<span className="text-danger">UNKNOWN QUEST {e}</span>
diff --git a/typescript/client/src/components/tables/seeds/SeedsTableTable.tsx b/typescript/client/src/components/tables/seeds/SeedsTableTable.tsx
index 3d607522b..15ad686fd 100644
--- a/typescript/client/src/components/tables/seeds/SeedsTableTable.tsx
+++ b/typescript/client/src/components/tables/seeds/SeedsTableTable.tsx
@@ -9,7 +9,7 @@ import { FormatGame } from "tachi-common";
 import { type Header } from "../components/TachiTable";
 
 export const SeedsTableHeaders: Header<TableWithRelated>[] = [
-	["ID", "ID", StrSOV((x) => x.tableID)],
+	["ID", "ID", StrSOV((x) => x.id)],
 	["Name", "Name", StrSOV((x) => x.title)],
 	["GPT", "GPT", StrSOV((x) => x.game)],
 	["Folders", "Folders", StrSOV((x) => x.title)],
@@ -17,7 +17,7 @@ export const SeedsTableHeaders: Header<TableWithRelated>[] = [
 
 export const SeedsTableSearchFns: SearchFunctions<TableWithRelated> = {
 	title: (x) => x.title,
-	tableID: (x) => x.tableID,
+	tableID: (x) => x.id,
 	inactive: (x) => x.inactive,
 	default: (x) => x.default,
 	description: (x) => x.description,
@@ -33,7 +33,7 @@ export const SeedsTableSearchFns: SearchFunctions<TableWithRelated> = {
 export const SeedsTableCells: CellsRenderFN<TableWithRelated> = ({ data }) => (
 	<>
 		<td>
-			<code>{data.tableID}</code>
+			<code>{data.id}</code>
 		</td>
 		<td>
 			<strong>{data.title}</strong>
diff --git a/typescript/client/src/types/seeds.ts b/typescript/client/src/types/seeds.ts
index 1a8dc7eb5..7eae09070 100644
--- a/typescript/client/src/types/seeds.ts
+++ b/typescript/client/src/types/seeds.ts
@@ -1,14 +1,15 @@
 import { type JSONAttributeDiff } from "#util/misc";
 import {
-	type BMSCourseDocument,
-	type ChartDocument,
-	type FolderDocument,
 	type GameGroup,
-	type GoalDocument,
-	type QuestDocument,
-	type QuestlineDocument,
+	type SEEDS_BMSCourseDocument,
+	type SEEDS_ChartDocument,
+	type SEEDS_FolderDocument,
+	type SEEDS_GoalDocument,
+	type SEEDS_QuestDocument,
+	type SEEDS_QuestlineDocument,
+	type SEEDS_SongDocument,
+	type SEEDS_TableDocument,
 	type SongDocument,
-	type TableDocument,
 	type V3Game,
 } from "tachi-common";
 
@@ -23,46 +24,46 @@ export type BMSCourseWithRelated = {
 		entries: Array<
 			| string
 			| {
-					chart: ChartDocument<"bms-7k" | "bms-14k">;
+					chart: SEEDS_ChartDocument<"bms-7k" | "bms-14k">;
 					song: SongDocument<"bms">;
 			  }
 		>;
 	};
-} & BMSCourseDocument;
+} & SEEDS_BMSCourseDocument;
 
 export type TableWithRelated = {
 	__related: {
 		/** Keys match `tables.json` folder slug strings (per game). */
 		folders: {
-			[folderSlug: string]: FolderDocument | undefined;
+			[folderSlug: string]: SEEDS_FolderDocument | undefined;
 		};
 	};
-} & TableDocument;
+} & SEEDS_TableDocument;
 
 export type QuestlineWithRelated = {
 	__related: {
 		quests: {
-			[questID: string]: QuestDocument | undefined;
+			[questID: string]: SEEDS_QuestDocument | undefined;
 		};
 	};
-} & QuestlineDocument;
+} & SEEDS_QuestlineDocument;
 
 export type QuestWithRelated = {
 	__related: {
 		goals: {
-			[goalID: string]: GoalDocument | undefined;
+			[goalID: string]: SEEDS_GoalDocument | undefined;
 		};
 	};
-} & QuestDocument;
+} & SEEDS_QuestDocument;
 
 export type ChartWithRelated<T extends V3Game = V3Game> = {
 	__related: {
 		song: SongDocument | undefined;
 	};
-} & ChartDocument<T>;
+} & SEEDS_ChartDocument<T>;
 
 type SongSeedsWithRelated = {
-	[G in GameGroup as `songs-${G}.json`]: Array<SongDocument<G>>;
+	[G in GameGroup as `songs-${G}.json`]: Array<SEEDS_SongDocument<G>>;
 };
 
 type ChartSeedsWithRelated = {
@@ -78,9 +79,9 @@ export type DatabaseSeedsWithRelated = {
 	"bms-course-lookup.json": Array<BMSCourseWithRelated>;
 
 	// intentional: folders don't need to be joined with anything.
-	"folders.json": Array<FolderDocument>;
+	"folders.json": Array<SEEDS_FolderDocument>;
 
-	"goals.json": Array<GoalDocument>;
+	"goals.json": Array<SEEDS_GoalDocument>;
 	"questlines.json": Array<QuestlineWithRelated>;
 	"quests.json": Array<QuestWithRelated>;
 	"tables.json": Array<TableWithRelated>;
diff --git a/typescript/client/src/util/data.ts b/typescript/client/src/util/data.ts
index 14b85d0cf..b0a0fa37b 100644
--- a/typescript/client/src/util/data.ts
+++ b/typescript/client/src/util/data.ts
@@ -4,9 +4,9 @@ import {
 	type GameGroup,
 	type GoalDocument,
 	type integer,
-	type QuestDocument,
 	type ScoreDocument,
 	type SessionScoreInfo,
+	type SEEDS_SongDocument,
 	type SongDocument,
 	type UserDocument,
 	type V3Game,
@@ -28,11 +28,13 @@ export function GetPBs(scoreInfo: SessionScoreInfo[]) {
 	});
 }
 
-export function CreateSongMap<G extends GameGroup = GameGroup>(songs: SongDocument<G>[]) {
+export function CreateSongMap<G extends GameGroup = GameGroup>(
+	songs: Array<SongDocument<G> | SEEDS_SongDocument<G>>,
+) {
 	const songMap = new Map<string, SongDocument<G>>();
 
 	for (const song of songs) {
-		songMap.set(song.id, song);
+		songMap.set(song.id, song as SongDocument<G>);
 	}
 
 	return songMap;
@@ -48,8 +50,8 @@ export function CreateUserMap(users: UserDocument[]) {
 	return userMap;
 }
 
-export function CreateGoalMap(goals: GoalDocument[]) {
-	const goalMap = new Map<string, GoalDocument>();
+export function CreateGoalMap<G extends { goalID: string }>(goals: Array<G>) {
+	const goalMap = new Map<string, G>();
 
 	for (const goal of goals) {
 		goalMap.set(goal.goalID, goal);
@@ -93,7 +95,9 @@ export function CreateChartLink(chart: ChartDocument) {
 }
 
 // stolen from server
-export function GetGoalIDsFromQuest(quest: QuestDocument) {
+export function GetGoalIDsFromQuest(quest: {
+	questData: Array<{ goals: Array<{ goalID: string }> }>;
+}) {
 	// this sucks - maybe a nicer way to do this, because nested
 	// maps are just ugly
 	return quest.questData.map((e) => e.goals.map((e) => e.goalID)).flat(1);
diff --git a/typescript/client/src/util/misc.ts b/typescript/client/src/util/misc.ts
index 965810b0c..83f629145 100644
--- a/typescript/client/src/util/misc.ts
+++ b/typescript/client/src/util/misc.ts
@@ -544,8 +544,8 @@ export function clamp(a: number, low: number, up: number) {
 	return a;
 }
 
-export function CreateQuestMap(quests: Array<QuestDocument>) {
-	const map = new Map<string, QuestDocument>();
+export function CreateQuestMap<Q extends { questID: string }>(quests: Array<Q>) {
+	const map = new Map<string, Q>();
 
 	for (const q of quests) {
 		map.set(q.questID, q);
diff --git a/typescript/client/src/util/seeds.ts b/typescript/client/src/util/seeds.ts
index 5a9d3c1ca..c5ae6a4ff 100644
--- a/typescript/client/src/util/seeds.ts
+++ b/typescript/client/src/util/seeds.ts
@@ -12,19 +12,20 @@ import {
 } from "#types/seeds";
 import {
 	type AllDatabaseSeeds,
-	type BMSCourseDocument,
-	type ChartDocument,
+	type ChartDocumentData,
 	computeFolderSlug,
 	CreateSongMap,
 	DatabaseSeedNames,
-	type FolderDocument,
 	type GameGroup,
-	type GoalDocument,
-	type QuestDocument,
-	type QuestlineDocument,
+	type SEEDS_BMSCourseDocument,
+	type SEEDS_ChartDocument,
+	type SEEDS_FolderDocument,
+	type SEEDS_GoalDocument,
+	type SEEDS_QuestDocument,
+	type SEEDS_QuestlineDocument,
+	type SEEDS_TableDocument,
 	type SeedFolderRow,
 	type SongDocument,
-	type TableDocument,
 } from "tachi-common";
 
 import { APIFetchV1 } from "./api";
@@ -211,10 +212,11 @@ function RelateBMSCourses(data: Partial<AllDatabaseSeeds>): BMSCourseWithRelated
 	}
 
 	const songMap = CreateSongMap(bmsSongs);
-	const chartMap = new Map<string, ChartDocument<"bms-7k" | "bms-14k">>();
+	const chartMap = new Map<string, SEEDS_ChartDocument<"bms-7k" | "bms-14k">>();
 
 	for (const chart of bmsCharts) {
-		chartMap.set(chart.data.hashMD5, chart);
+		const d = chart.data as ChartDocumentData["bms-7k"] | ChartDocumentData["bms-14k"];
+		chartMap.set(d.hashMD5, chart);
 	}
 
 	return base.map((course) => {
@@ -236,7 +238,7 @@ function RelateBMSCourses(data: Partial<AllDatabaseSeeds>): BMSCourseWithRelated
 
 					return {
 						chart: chartMap.get(e)!,
-						song: songMap.get(chartMap.get(e)!.song.id)!,
+						song: songMap.get(chartMap.get(e)!.songID)! as SongDocument<"bms">,
 					};
 				}),
 			},
@@ -253,17 +255,12 @@ function RelateTables(data: Partial<AllDatabaseSeeds>): TableWithRelated[] {
 		return [];
 	}
 
-	const folderById = new Map<string, FolderDocument>();
-	const folderByGameSlug = new Map<string, FolderDocument>();
+	const folderById = new Map<string, SEEDS_FolderDocument>();
+	const folderByGameSlug = new Map<string, SEEDS_FolderDocument>();
 
 	for (const folder of data["folders.json"] ?? []) {
-		const raw = folder as {
-			id?: string;
-			slug?: string;
-			versionFilter?: Array<string>;
-			where?: string;
-		} & FolderDocument;
-		const id = raw.folderID ?? raw.id;
+		const raw = folder;
+		const id = raw.id;
 
 		if (id !== undefined) {
 			folderById.set(id, folder);
@@ -340,10 +337,12 @@ function RelateQuests(data: Partial<AllDatabaseSeeds>): QuestWithRelated[] {
 function RelateCharts(data: Partial<AllDatabaseSeeds>, file: string): ChartWithRelated[] {
 	const [_, game] = /charts-(.*?)\.json/u.exec(file)!;
 
-	// @ts-expect-error too lazy to fix this properly
-	const songs: SongDocument[] = data[`songs-${game}.json`];
-	// @ts-expect-error too lazy to fix this properly
-	const charts: ChartDocument[] = data[`charts-${game}.json`];
+	const songs = data[`songs-${game}.json` as keyof AllDatabaseSeeds] as
+		| Array<SongDocument>
+		| undefined;
+	const charts = data[`charts-${game}.json` as keyof AllDatabaseSeeds] as
+		| Array<SEEDS_ChartDocument>
+		| undefined;
 
 	if (!charts) {
 		return [];
@@ -358,7 +357,7 @@ function RelateCharts(data: Partial<AllDatabaseSeeds>, file: string): ChartWithR
 	return charts.map((e) => ({
 		...e,
 		__related: {
-			song: songMap.get(e.song.id),
+			song: songMap.get(e.songID),
 		},
 	}));
 }
@@ -542,34 +541,34 @@ function GetUniqID<K extends keyof AllDatabaseSeeds>(collection: K, value: AllDa
 	if (collection.startsWith("songs-")) {
 		return (value as SongDocument).id.toString();
 	} else if (collection.startsWith("charts-")) {
-		return (value as ChartDocument).chartID;
+		return (value as SEEDS_ChartDocument).id;
 	}
 
 	const c = collection as NotSongsChartsSeeds;
 
 	switch (c) {
 		case "bms-course-lookup.json": {
-			const v = value as BMSCourseDocument;
+			const v = value as SEEDS_BMSCourseDocument;
 			return `${v.set}-${v.game}-${v.value}`;
 		}
 		case "folders.json": {
-			const v = value as { id?: string } & FolderDocument;
-			return v.folderID ?? v.id ?? "";
+			const v = value as SEEDS_FolderDocument;
+			return v.id;
 		}
 		case "tables.json": {
-			const v = value as TableDocument;
-			return v.tableID;
+			const v = value as SEEDS_TableDocument;
+			return v.id;
 		}
 		case "goals.json": {
-			const v = value as GoalDocument;
+			const v = value as SEEDS_GoalDocument;
 			return v.goalID;
 		}
 		case "quests.json": {
-			const v = value as QuestDocument;
+			const v = value as SEEDS_QuestDocument;
 			return v.questID;
 		}
 		case "questlines.json": {
-			const v = value as QuestlineDocument;
+			const v = value as SEEDS_QuestlineDocument;
 			return v.questlineID;
 		}
 	}
diff --git a/typescript/common/src/config/game-support/maimai-dx.ts b/typescript/common/src/config/game-support/maimai-dx.ts
index d1238fe0d..b7ef42cf7 100644
--- a/typescript/common/src/config/game-support/maimai-dx.ts
+++ b/typescript/common/src/config/game-support/maimai-dx.ts
@@ -174,7 +174,7 @@ export const GAME_MAIMAI_DX_CONF = {
 	defaultProfileRatingAlg: "naiveRate",
 
 	difficulties: {
-		type: "FIXED",
+		type: "CHUGEKIMAI_STYLE",
 		order: [
 			"Basic",
 			"Advanced",
diff --git a/typescript/common/src/config/game-support/maimai.ts b/typescript/common/src/config/game-support/maimai.ts
index b26d37444..d761d24f2 100644
--- a/typescript/common/src/config/game-support/maimai.ts
+++ b/typescript/common/src/config/game-support/maimai.ts
@@ -124,12 +124,8 @@ export const GAME_MAIMAI_CONF = {
 	defaultSessionRatingAlg: "rate",
 	defaultProfileRatingAlg: "naiveRate",
 
-	// Similar to CHUNITHM, this game has a dynamic set of difficulties,
-	// with a song able to have as many UTAGE difficulties as it likes.
-	// This will also not be implemented for the same reasons as CHUNITHM.
-	// Sorry!
 	difficulties: {
-		type: "FIXED",
+		type: "CHUGEKIMAI_STYLE",
 		order: ["Easy", "Basic", "Advanced", "Expert", "Master", "Re:Master"],
 		format: {
 			Easy: "ESY",
diff --git a/typescript/common/src/config/game-support/ongeki.ts b/typescript/common/src/config/game-support/ongeki.ts
index b4ae84dba..462bcfb43 100644
--- a/typescript/common/src/config/game-support/ongeki.ts
+++ b/typescript/common/src/config/game-support/ongeki.ts
@@ -182,7 +182,7 @@ export const GAME_ONGEKI_CONF = {
 	defaultProfileRatingAlg: "naiveRating",
 
 	difficulties: {
-		type: "FIXED",
+		type: "CHUGEKIMAI_STYLE",
 		order: ["BASIC", "ADVANCED", "EXPERT", "MASTER", "LUNATIC"],
 		format: {
 			BASIC: "BAS",
diff --git a/typescript/common/src/seeds/types.ts b/typescript/common/src/seeds/types.ts
index 71aab44f3..b97319c73 100644
--- a/typescript/common/src/seeds/types.ts
+++ b/typescript/common/src/seeds/types.ts
@@ -1,15 +1,14 @@
+import type { GameGroup, V3Game } from "../types";
 import type {
-	BMSCourseDocument,
-	ChartDocument,
-	FolderDocument,
-	GameGroup,
-	GoalDocument,
-	QuestDocument,
-	QuestlineDocument,
-	SongDocument,
-	TableDocument,
-	V3Game,
-} from "../types";
+	SEEDS_BMSCourseDocument,
+	SEEDS_ChartDocument,
+	SEEDS_FolderDocument,
+	SEEDS_GoalDocument,
+	SEEDS_QuestDocument,
+	SEEDS_QuestlineDocument,
+	SEEDS_SongDocument,
+	SEEDS_TableDocument,
+} from "../types/seeds-documents";
 
 import { allSupportedGameGroups } from "../config/config";
 
@@ -17,20 +16,20 @@ import { allSupportedGameGroups } from "../config/config";
 // note that TS won't let you do this multiple times within an object
 // so, we have to join them ourselves. Ah well, not that bad.
 type ChartDBSeeds = {
-	[TGame in V3Game as `charts-${TGame}.json`]: Array<ChartDocument<TGame>>;
+	[TGame in V3Game as `charts-${TGame}.json`]: Array<SEEDS_ChartDocument<TGame>>;
 };
 
 type SongDBSeeds = {
-	[G in GameGroup as `songs-${G}.json`]: Array<SongDocument<G>>;
+	[G in GameGroup as `songs-${G}.json`]: Array<SEEDS_SongDocument<G>>;
 };
 
 interface OtherDBSeeds {
-	"bms-course-lookup.json": Array<BMSCourseDocument>;
-	"folders.json": Array<FolderDocument>;
-	"goals.json": Array<GoalDocument>;
-	"questlines.json": Array<QuestlineDocument>;
-	"quests.json": Array<QuestDocument>;
-	"tables.json": Array<TableDocument>;
+	"bms-course-lookup.json": Array<SEEDS_BMSCourseDocument>;
+	"folders.json": Array<SEEDS_FolderDocument>;
+	"goals.json": Array<SEEDS_GoalDocument>;
+	"questlines.json": Array<SEEDS_QuestlineDocument>;
+	"quests.json": Array<SEEDS_QuestDocument>;
+	"tables.json": Array<SEEDS_TableDocument>;
 }
 
 export type AllDatabaseSeeds = ChartDBSeeds & OtherDBSeeds & SongDBSeeds;
diff --git a/typescript/common/src/types.ts b/typescript/common/src/types.ts
index af57a17ad..fcf0396ff 100644
--- a/typescript/common/src/types.ts
+++ b/typescript/common/src/types.ts
@@ -31,3 +31,4 @@ export * from "./types/documents";
 export * from "./types/game-config";
 export * from "./types/import-types";
 export * from "./types/notifications";
+export * from "./types/seeds-documents";
diff --git a/typescript/common/src/types/game-config-utils.ts b/typescript/common/src/types/game-config-utils.ts
index d22a1a2aa..0790615f4 100644
--- a/typescript/common/src/types/game-config-utils.ts
+++ b/typescript/common/src/types/game-config-utils.ts
@@ -123,10 +123,36 @@ export interface FixedDifficulties<Difficulty extends string> {
 	order: ReadonlyArray<Difficulty>;
 
 	/**
-	 * For mobile view (and certain pages where things are generally smaller)
-	 * how should we shorten these difficulty names?
+	 * How should we format these difficulty names?
+	 */
+	format: Partial<Record<Difficulty, string>>;
+
+	default: Difficulty;
+}
+
+/**
+ * This is for chugekimai; where they have a "fixed" set of difficulties, and then a dynamic amount
+ * of difficulties for LUNATIC/WORLD'S END/UTAGE charts. This way, we can have the fixed set and
+ * still support the dynamic set of additional ones.
+ *
+ * This is a bit of a bodge. We don't have a nice way of handling this - but we also don't have a
+ * nice way of disambiguating score imports as usual - we can't let people import "i got xxx on
+ * the worlds end for yyy", because such a uniqueness relation *does not exist*. the difficulty name
+ * is not the unique bit - it is meaningless flavour like the dynamic diffnames.
+ *
+ * Originally, I called this "SEMI_FIXED", which is the sort of ZK quirkiness you've came to know at
+ * this point, but now there's no point, this is for chugekimai, and this makes it clear.
+ */
+export interface ChuGekiMaiDifficulties<Difficulty extends string> {
+	type: "CHUGEKIMAI_STYLE";
+
+	order: ReadonlyArray<Difficulty>;
+
+	/**
+	 * How should we format these difficulty names?
 	 *
-	 * For example, in IIDX "ANOTHER" is generally shortened to "A".
+	 * Dynamic ones (i.e. ones not in the Order set) are not formatted - they are printed
+	 * exactly as-is.
 	 */
 	format: Partial<Record<Difficulty, string>>;
 
@@ -134,5 +160,6 @@ export interface FixedDifficulties<Difficulty extends string> {
 }
 
 export type DifficultyConfig<D extends string = string> =
+	| ChuGekiMaiDifficulties<D>
 	| DynamicDifficulties
 	| FixedDifficulties<D>;
diff --git a/typescript/common/src/types/game-config.ts b/typescript/common/src/types/game-config.ts
index 979914dc6..ef642d78b 100644
--- a/typescript/common/src/types/game-config.ts
+++ b/typescript/common/src/types/game-config.ts
@@ -241,6 +241,7 @@ export type LEGACY_GameToPlaytype = {
 export type Difficulties = {
 	// If this game has fixed difficulties, infer what they are
 	// otherwise, difficulties are an arbitrary string
+	// n.b. still true even with the new chugekimai stuff
 	[TGame in V3Game]: (typeof GAME_CONFIGS)[TGame]["difficulties"] extends FixedDifficulties<
 		infer D
 	>
diff --git a/typescript/common/src/types/seeds-documents-zod.ts b/typescript/common/src/types/seeds-documents-zod.ts
new file mode 100644
index 000000000..041daafef
--- /dev/null
+++ b/typescript/common/src/types/seeds-documents-zod.ts
@@ -0,0 +1,253 @@
+import z from "zod";
+
+import type {
+	ChartDocumentData,
+	Difficulties,
+	GameGroup,
+	SongDocumentData,
+	V3Game,
+	Versions,
+} from "./game-config";
+import type { DifficultyConfig } from "./game-config-utils";
+
+import {
+	ALL_GAMES,
+	allSupportedGameGroups,
+	GAME_GROUP_CONFIGS,
+	GetSpecificGameConfig,
+} from "../config/config";
+
+/** Tachi seed row id: one-letter prefix + 19 lowercase hex digits. */
+export function SEEDS_TachiIdSchema(prefix: string) {
+	return z.string().regex(new RegExp(`^${prefix}[0-9a-f]{19}$`, "u"));
+}
+
+export const SEEDS_V3_GAME_SCHEMA = z.enum(ALL_GAMES as [V3Game, ...Array<V3Game>]);
+
+export const SEEDS_V3_GAME_GROUP_SCHEMA = z.enum(
+	allSupportedGameGroups as [GameGroup, ...Array<GameGroup>],
+);
+
+function difficultyZodSchema<G extends V3Game>(game: G): z.ZodType<Difficulties[G]> {
+	const d = GetSpecificGameConfig(game).difficulties as DifficultyConfig;
+	if (d.type === "DYNAMIC") {
+		return z.string() as unknown as z.ZodType<Difficulties[G]>;
+	}
+	const order = d.order as ReadonlyArray<string>;
+	return z.enum(order as [string, ...Array<string>]) as unknown as z.ZodType<Difficulties[G]>;
+}
+
+function versionsZodSchema<G extends V3Game>(game: G): z.ZodType<Array<Versions[G]>> {
+	const versionKeys = Object.keys(GetSpecificGameConfig(game).versions);
+
+	return z.array(z.string()).superRefine((val, ctx) => {
+		if (versionKeys.length === 0) {
+			if (val.length > 0) {
+				ctx.addIssue({
+					code: z.ZodIssueCode.custom,
+					message: "This game defines no chart versions; expected [].",
+				});
+			}
+			return;
+		}
+
+		for (const v of val) {
+			if (!versionKeys.includes(v)) {
+				ctx.addIssue({
+					code: z.ZodIssueCode.custom,
+					message: `Invalid version ${v}`,
+				});
+			}
+		}
+
+		if (new Set(val).size !== val.length) {
+			ctx.addIssue({
+				code: z.ZodIssueCode.custom,
+				message: "Versions array shouldn't contain the same version twice",
+			});
+		}
+	}) as unknown as z.ZodType<Array<Versions[G]>>;
+}
+
+function seedsChartDocumentSchemaForGame<G extends V3Game>(game: G) {
+	const chartData = GetSpecificGameConfig(game).chartData as unknown as z.ZodType<ChartDocumentData[G]>;
+
+	return z.strictObject({
+		data: chartData,
+		difficulty: difficultyZodSchema(game),
+		id: SEEDS_TachiIdSchema("C"),
+		isPrimary: z.boolean(),
+		legacyChartID: z.string(),
+		level: z.string(),
+		levelNum: z.number(),
+		songID: SEEDS_TachiIdSchema("S"),
+		versions: versionsZodSchema(game),
+	}) as unknown as z.ZodType<{
+		data: ChartDocumentData[G];
+		difficulty: Difficulties[G];
+		id: string;
+		isPrimary: boolean;
+		legacyChartID: string;
+		level: string;
+		levelNum: number;
+		songID: string;
+		versions: Array<Versions[G]>;
+	}>;
+}
+
+/** One schema per `charts-${game}.json` collection. */
+export const SEEDS_CHART_DOCUMENT_SCHEMAS = Object.fromEntries(
+	ALL_GAMES.map((game) => [game, seedsChartDocumentSchemaForGame(game)]),
+) as {
+	readonly [G in V3Game]: ReturnType<typeof seedsChartDocumentSchemaForGame>;
+};
+
+export type SEEDS_ChartDocument<TGame extends V3Game = V3Game> = z.infer<
+	(typeof SEEDS_CHART_DOCUMENT_SCHEMAS)[TGame]
+>;
+
+function seedsSongDocumentSchemaForGroup<G extends GameGroup>(group: G) {
+	const songData = GAME_GROUP_CONFIGS[group].songData as unknown as z.ZodType<SongDocumentData[G]>;
+
+	return z.strictObject({
+		altTitles: z.array(z.string()),
+		artist: z.string(),
+		data: songData,
+		id: SEEDS_TachiIdSchema("S"),
+		legacySongID: z.number(),
+		searchTerms: z.array(z.string()),
+		title: z.string(),
+	}) as unknown as z.ZodType<{
+		altTitles: Array<string>;
+		artist: string;
+		data: SongDocumentData[G];
+		id: string;
+		legacySongID: number;
+		searchTerms: Array<string>;
+		title: string;
+	}>;
+}
+
+/** One schema per `songs-${gameGroup}.json` collection. */
+export const SEEDS_SONG_DOCUMENT_SCHEMAS = Object.fromEntries(
+	allSupportedGameGroups.map((group) => [group, seedsSongDocumentSchemaForGroup(group)]),
+) as {
+	readonly [G in GameGroup]: ReturnType<typeof seedsSongDocumentSchemaForGroup>;
+};
+
+export type SEEDS_SongDocument<G extends GameGroup = GameGroup> = z.infer<
+	(typeof SEEDS_SONG_DOCUMENT_SCHEMAS)[G]
+>;
+
+export const SEEDS_BMS_COURSE_DOCUMENT_SCHEMA = z.strictObject({
+	game: z.enum(["bms-14k", "bms-7k", "pms-controller", "pms-keyboard"]),
+	md5sums: z.string(),
+	set: z.string(),
+	title: z.string(),
+	value: z.string(),
+});
+
+export type SEEDS_BMSCourseDocument = z.infer<typeof SEEDS_BMS_COURSE_DOCUMENT_SCHEMA>;
+
+export const SEEDS_TABLE_DOCUMENT_SCHEMA = z.strictObject({
+	default: z.boolean(),
+	description: z.string(),
+	folders: z.array(z.string()),
+	game: SEEDS_V3_GAME_SCHEMA,
+	id: SEEDS_TachiIdSchema("T"),
+	inactive: z.boolean(),
+	legacyTableID: z.string(),
+	slug: z.string().optional(),
+	title: z.string(),
+});
+
+export type SEEDS_TableDocument = z.infer<typeof SEEDS_TABLE_DOCUMENT_SCHEMA>;
+
+const seedsQuestGoalRefSchema = z.strictObject({
+	goalID: z.string(),
+	note: z.string().optional(),
+});
+
+const seedsQuestSectionSchema = z.strictObject({
+	desc: z.string().optional(),
+	goals: z.array(seedsQuestGoalRefSchema),
+	title: z.string(),
+});
+
+export const SEEDS_QUEST_DOCUMENT_SCHEMA = z.strictObject({
+	desc: z.string(),
+	game: SEEDS_V3_GAME_GROUP_SCHEMA,
+	name: z.string(),
+	playtype: z.string(),
+	questData: z.array(seedsQuestSectionSchema),
+	questID: z.string(),
+});
+
+export type SEEDS_QuestDocument = z.infer<typeof SEEDS_QUEST_DOCUMENT_SCHEMA>;
+
+export const SEEDS_QUESTLINE_DOCUMENT_SCHEMA = z.strictObject({
+	desc: z.string(),
+	game: SEEDS_V3_GAME_GROUP_SCHEMA,
+	name: z.string(),
+	playtype: z.string(),
+	questlineID: z.string(),
+	quests: z.array(z.string()),
+});
+
+export type SEEDS_QuestlineDocument = z.infer<typeof SEEDS_QUESTLINE_DOCUMENT_SCHEMA>;
+
+/** Row shape in `folders.json` seed collections. */
+export const SEEDS_FOLDER_DOCUMENT_SCHEMA = z.strictObject({
+	game: SEEDS_V3_GAME_SCHEMA,
+	id: SEEDS_TachiIdSchema("F"),
+	inactive: z.boolean(),
+	legacyFolderID: z.string(),
+	searchTerms: z.array(z.string()),
+	slug: z.string(),
+	title: z.string(),
+	versionFilter: z.array(z.string()).optional(),
+	where: z.string(),
+});
+
+export type SEEDS_FolderDocument = z.infer<typeof SEEDS_FOLDER_DOCUMENT_SCHEMA>;
+
+const SEEDS_GOAL_CRITERIA_SCHEMA = z.union([
+	z.strictObject({
+		countNum: z.number(),
+		key: z.string(),
+		mode: z.union([z.literal("absolute"), z.literal("proportion")]),
+		value: z.number(),
+	}),
+	z.strictObject({
+		key: z.string(),
+		mode: z.literal("single"),
+		value: z.number(),
+	}),
+]);
+
+const SEEDS_GOAL_CHARTS_SCHEMA = z.discriminatedUnion("type", [
+	z.strictObject({
+		data: z.string(),
+		folderSlug: z.string().optional(),
+		type: z.literal("folder"),
+	}),
+	z.strictObject({
+		data: z.array(z.string()),
+		type: z.literal("multi"),
+	}),
+	z.strictObject({
+		data: z.string(),
+		type: z.literal("single"),
+	}),
+]);
+
+export const SEEDS_GOAL_DOCUMENT_SCHEMA = z.strictObject({
+	charts: SEEDS_GOAL_CHARTS_SCHEMA,
+	criteria: SEEDS_GOAL_CRITERIA_SCHEMA,
+	game: SEEDS_V3_GAME_GROUP_SCHEMA,
+	goalID: z.string(),
+	name: z.string(),
+	playtype: z.string(),
+});
+
+export type SEEDS_GoalDocument = z.infer<typeof SEEDS_GOAL_DOCUMENT_SCHEMA>;
diff --git a/typescript/common/src/types/seeds-documents.ts b/typescript/common/src/types/seeds-documents.ts
new file mode 100644
index 000000000..8c7f05fe8
--- /dev/null
+++ b/typescript/common/src/types/seeds-documents.ts
@@ -0,0 +1 @@
+export * from "./seeds-documents-zod";
diff --git a/typescript/common/src/utils/util.ts b/typescript/common/src/utils/util.ts
index d875a6f59..e6453c85b 100644
--- a/typescript/common/src/utils/util.ts
+++ b/typescript/common/src/utils/util.ts
@@ -10,6 +10,8 @@ import type {
 	GamesForGroup,
 	integer,
 	LEGACY_Playtypes,
+	SEEDS_BMSCourseDocument,
+	SEEDS_SongDocument,
 	SongDocument,
 	V3Game,
 } from "../types";
@@ -357,11 +359,13 @@ export function GetCloserGradeDelta<G extends string>(
 	return lower;
 }
 
-export function CreateSongMap<G extends GameGroup = GameGroup>(songs: Array<SongDocument<G>>) {
+export function CreateSongMap<G extends GameGroup = GameGroup>(
+	songs: Array<SEEDS_SongDocument<G> | SongDocument<G>>,
+) {
 	const songMap = new Map<string, SongDocument<G>>();
 
 	for (const song of songs) {
-		songMap.set(song.id, song);
+		songMap.set(song.id, song as SongDocument<G>);
 	}
 
 	return songMap;
@@ -391,7 +395,7 @@ export function FormatPrError(err: PrudenceError, foreword = "Error"): string {
 	return `${foreword}: ${err.keychain} | ${err.message}${receivedText}.`;
 }
 
-export function GetBMSCourseIndex(course: BMSCourseDocument) {
+export function GetBMSCourseIndex(course: BMSCourseDocument | SEEDS_BMSCourseDocument) {
 	const gameConfig = GetGameConfig(course.game);
 
 	const cls = gameConfig.classes[course.set as keyof typeof gameConfig.classes];
diff --git a/typescript/seeds-scripts/test/collections.test.ts b/typescript/seeds-scripts/test/collections.test.ts
index 811dfb3ae..743a123d8 100644
--- a/typescript/seeds-scripts/test/collections.test.ts
+++ b/typescript/seeds-scripts/test/collections.test.ts
@@ -71,8 +71,6 @@ for (const collection of collections) {
 		} else {
 			success++;
 		}
-
-		success++;
 	}
 
 	const report = `GOOD: ${success}, BAD: ${fails}(${Math.min(
diff --git a/typescript/seeds-scripts/test/references.test.ts b/typescript/seeds-scripts/test/references.test.ts
index 2d8dc4d92..7f2eaa7b1 100644
--- a/typescript/seeds-scripts/test/references.test.ts
+++ b/typescript/seeds-scripts/test/references.test.ts
@@ -54,7 +54,7 @@ const refChecks: Array<ReferenceCheck> = [
 		base: "tables",
 		baseKey: (table) => table.folders.map((slug: string) => `${table.game}:${slug}`),
 		parent: "folders",
-		parentKey: (folder) => `${folder.game}:${folderSeedSlug(folder)}`,
+		parentKey: (folder) => [`${folder.game}:${folderSeedSlug(folder)}`],
 		gameGroup: null,
 		game: null,
 	},
diff --git a/typescript/seeds-scripts/test/schemas.ts b/typescript/seeds-scripts/test/schemas.ts
index 7dd4627a0..93aec594a 100644
--- a/typescript/seeds-scripts/test/schemas.ts
+++ b/typescript/seeds-scripts/test/schemas.ts
@@ -1,12 +1,18 @@
 import {
 	ALL_GAMES,
 	allSupportedGameGroups,
-	GAME_CONFIGS,
-	GAME_GROUP_CONFIGS,
+	SEEDS_BMS_COURSE_DOCUMENT_SCHEMA,
+	SEEDS_CHART_DOCUMENT_SCHEMAS,
+	SEEDS_FOLDER_DOCUMENT_SCHEMA,
+	SEEDS_GOAL_DOCUMENT_SCHEMA,
+	SEEDS_QUEST_DOCUMENT_SCHEMA,
+	SEEDS_QUESTLINE_DOCUMENT_SCHEMA,
+	SEEDS_SONG_DOCUMENT_SCHEMAS,
+	SEEDS_TABLE_DOCUMENT_SCHEMA,
 	type GameGroup,
 	type V3Game,
 } from "tachi-common";
-import { z, type ZodType } from "zod";
+import { type ZodType } from "zod";
 
 export type AllCollections =
 	| "bms-course-lookup.json"
@@ -18,94 +24,23 @@ export type AllCollections =
 	| `charts-${V3Game}.json`
 	| `songs-${GameGroup}.json`;
 
-export const V3_GAME_SCHEMA = z.enum(ALL_GAMES as [V3Game, ...Array<V3Game>]);
-export const V3_GAME_GROUP_SCHEMA = z.enum(
-	allSupportedGameGroups as [GameGroup, ...Array<GameGroup>],
-);
+/** @deprecated Use {@link SEEDS_CHART_DOCUMENT_SCHEMAS} from tachi-common. */
+export const V3_CHART_SCHEMAS = Object.fromEntries(
+	ALL_GAMES.map((game) => [`charts-${game}.json` as const, SEEDS_CHART_DOCUMENT_SCHEMAS[game]]),
+) as Record<`charts-${V3Game}.json`, ZodType>;
 
-export const V3_TACHI_ID = (prefix: string) =>
-	z.string().regex(new RegExp(`^${prefix}[0-9a-f]{19}$`, "u"));
-
-export const V3_FOLDER_SCHEMA = z.strictObject({
-	title: z.string(),
-	game: V3_GAME_SCHEMA,
-	id: V3_TACHI_ID("F"),
-	legacyFolderID: z.string(),
-	inactive: z.boolean(),
-	searchTerms: z.array(z.string()),
-	versionFilter: z.array(z.string()).optional(),
-	where: z.string(),
-	slug: z.string().optional(),
-});
-
-export const V3_TABLE_SCHEMA = z.strictObject({
-	game: V3_GAME_SCHEMA,
-	id: V3_TACHI_ID("T"),
-	legacyTableID: z.string(),
-	inactive: z.boolean(),
-	title: z.string(),
-	description: z.string(),
-	slug: z.string().optional(),
-	default: z.boolean(),
-	folders: z.array(z.string()),
-});
-
-export const V3_BMS_COURSE_LOOKUP_SCHEMA = z.strictObject({
-	md5sums: z.string(),
-	title: z.string(),
-	set: z.string(),
-	game: z.enum(["bms-7k", "bms-14k"]),
-	value: z.string(),
-});
-
-// TODO(zk): impl
-export const V3_QUEST_SCHEMA = z.any();
-export const V3_QUESTLINE_SCHEMA = z.any();
-export const V3_GOAL_SCHEMA = z.any();
-
-export const V3_SONG_SCHEMAS: Record<`songs-${GameGroup}.json`, ZodType> = Object.fromEntries(
-	allSupportedGameGroups.map((gameGroup) => [
-		`songs-${gameGroup}.json` as const,
-		z.strictObject({
-			id: V3_TACHI_ID("S"),
-			legacySongID: z.number(),
-			title: z.string(),
-			artist: z.string(),
-			altTitles: z.array(z.string()),
-			searchTerms: z.array(z.string()),
-			data: GAME_GROUP_CONFIGS[gameGroup].songData,
-		}),
-	]),
-) as unknown as Record<`songs-${GameGroup}.json`, ZodType>;
-// ^ object.fromEntries is hardcoded to [k: string]
-// even when k is a subset of string
-
-export const V3_CHART_SCHEMAS: Record<`charts-${V3Game}.json`, ZodType> = Object.fromEntries(
-	ALL_GAMES.map((game) => [
-		`charts-${game}.json` as const,
-		z.strictObject({
-			id: V3_TACHI_ID("C"),
-			// TODO(zk): Game specific?
-			difficulty: z.string(),
-			isPrimary: z.boolean(),
-			legacyChartID: z.string(),
-			level: z.string(),
-			levelNum: z.number(),
-			songID: V3_TACHI_ID("S"),
-			versions: z.array(z.string()),
-			data: GAME_CONFIGS[game].chartData,
-		}),
-	]),
-) as unknown as Record<`charts-${V3Game}.json`, ZodType>;
+/** @deprecated Use {@link SEEDS_SONG_DOCUMENT_SCHEMAS} from tachi-common. */
+export const V3_SONG_SCHEMAS = Object.fromEntries(
+	allSupportedGameGroups.map((g) => [`songs-${g}.json` as const, SEEDS_SONG_DOCUMENT_SCHEMAS[g]]),
+) as Record<`songs-${GameGroup}.json`, ZodType>;
 
 export const V3_SCHEMAS: Record<AllCollections, ZodType> = {
-	"bms-course-lookup.json": V3_BMS_COURSE_LOOKUP_SCHEMA,
-	"folders.json": V3_FOLDER_SCHEMA,
-	"tables.json": V3_TABLE_SCHEMA,
-	"quests.json": V3_QUEST_SCHEMA,
-	"questlines.json": V3_QUESTLINE_SCHEMA,
-	"goals.json": V3_GOAL_SCHEMA,
-
+	"bms-course-lookup.json": SEEDS_BMS_COURSE_DOCUMENT_SCHEMA,
+	"folders.json": SEEDS_FOLDER_DOCUMENT_SCHEMA,
+	"goals.json": SEEDS_GOAL_DOCUMENT_SCHEMA,
+	"questlines.json": SEEDS_QUESTLINE_DOCUMENT_SCHEMA,
+	"quests.json": SEEDS_QUEST_DOCUMENT_SCHEMA,
+	"tables.json": SEEDS_TABLE_DOCUMENT_SCHEMA,
 	...V3_SONG_SCHEMAS,
 	...V3_CHART_SCHEMAS,
 };
diff --git a/typescript/seeds-scripts/test/table-default.test.ts b/typescript/seeds-scripts/test/table-default.test.ts
index ae22a6567..32e431612 100644
--- a/typescript/seeds-scripts/test/table-default.test.ts
+++ b/typescript/seeds-scripts/test/table-default.test.ts
@@ -1,14 +1,13 @@
 import type { z } from "zod";
 
 import chalk from "chalk";
-import { ALL_GAMES, FormatGame } from "tachi-common";
+import { ALL_GAMES, FormatGame, type SEEDS_TABLE_DOCUMENT_SCHEMA } from "tachi-common";
 
 import { ReadCollection } from "../util";
-import { type V3_TABLE_SCHEMA } from "./schemas";
 
 const defaultTableMap = {};
 
-const tables: Array<z.infer<typeof V3_TABLE_SCHEMA>> = ReadCollection("tables.json");
+const tables: Array<z.infer<typeof SEEDS_TABLE_DOCUMENT_SCHEMA>> = ReadCollection("tables.json");
 
 let errs = 0;
 
diff --git a/typescript/seeds-scripts/tsconfig.json b/typescript/seeds-scripts/tsconfig.json
index 70dfcbafb..2915b18c4 100644
--- a/typescript/seeds-scripts/tsconfig.json
+++ b/typescript/seeds-scripts/tsconfig.json
@@ -11,5 +11,5 @@
 			"#*": ["./src/*"]
 		}
 	},
-	"exclude": ["node_modules"]
+	"exclude": ["node_modules", "rerunners/**"]
 }
diff --git a/typescript/server/src/lib/score-import/framework/common/string-asserts.ts b/typescript/server/src/lib/score-import/framework/common/string-asserts.ts
index 364a27609..f6f4ff5c0 100644
--- a/typescript/server/src/lib/score-import/framework/common/string-asserts.ts
+++ b/typescript/server/src/lib/score-import/framework/common/string-asserts.ts
@@ -11,10 +11,6 @@ export function AssertStrAsDifficulty(strVal: string, game: V3Game): Difficultie
 	}
 
 	if (!diffConf.order.includes(strVal)) {
-		if (game === "chunithm" && strVal === "WORLD'S END") {
-			throw new InvalidScoreFailure("WORLD'S END is not supported. Sorry.");
-		}
-
 		throw new InvalidScoreFailure(
 			`Invalid Difficulty for ${FormatGame(game)} - Expected any of ${diffConf.order.join(
 				", ",
diff --git a/typescript/server/src/lib/score-import/import-types/common/batch-manual/converter.ts b/typescript/server/src/lib/score-import/import-types/common/batch-manual/converter.ts
index 490039ebc..9076964a2 100644
--- a/typescript/server/src/lib/score-import/import-types/common/batch-manual/converter.ts
+++ b/typescript/server/src/lib/score-import/import-types/common/batch-manual/converter.ts
@@ -482,6 +482,23 @@ export async function ResolveChartFromSong(
 
 	const difficulty = AssertStrAsDifficulty(resolver.difficulty, game);
 
+	const gameConfig = GetGameConfig(resolver.game);
+	switch (gameConfig.difficulties.type) {
+		case "DYNAMIC":
+			throw new InvalidScoreFailure(
+				"You cannot use a songTitle+difficulty lookup for a game with 'DYNAMIC' difficulties",
+			);
+		case "CHUGEKIMAI_STYLE":
+			if (!gameConfig.difficulties.order.includes(difficulty)) {
+				throw new InvalidScoreFailure(
+					`This difficulty "${difficulty}" is not supported for songTitle+difficulty lookups. If you are trying to import for WORLD'S END/LUNATIC/UTAGE scores, you must use inGameID, or a different lookup method.`,
+				);
+			}
+			break;
+		case "FIXED":
+			break;
+	}
+
 	let chart;
 
 	if (resolver.version) {