diff --git a/server/src/lib/score-import/framework/calculated-data/calculated-data.ts b/server/src/lib/score-import/framework/calculated-data/calculated-data.ts
index 410469bef..8130ee411 100644
--- a/server/src/lib/score-import/framework/calculated-data/calculated-data.ts
+++ b/server/src/lib/score-import/framework/calculated-data/calculated-data.ts
@@ -13,8 +13,10 @@ import {
 	PoyashiBPI,
 	Volforce,
 	WACCARate,
+	ITGHighestUnbroken,
 } from "rg-stats";
 import { GetGamePTConfig } from "tachi-common";
+import { IsNullish } from "utils/misc";
 import type { DryScore } from "../common/types";
 import type { KtLogger } from "lib/logger/logger";
 import type { ChartDocument, Game, IDStrings, Lamps, Playtypes, ScoreDocument } from "tachi-common";
@@ -68,6 +70,7 @@ const CalculatedDataFunctions: CalculatedDataFunctionsType = {
 	"jubeat:Single": CalculateDataJubeat,
 	"pms:Keyboard": CalculateDataPMSorBMS,
 	"pms:Controller": CalculateDataPMSorBMS,
+	"itg:Stamina": CalculateDataITGStamina,
 };
 
 // Creates Game-Specific calculatedData for the provided game & playtype.
@@ -239,3 +242,33 @@ function CalculateDataPopn(
 		),
 	};
 }
+
+function CalculateDataITGStamina(
+	dryScore: DryScore<"itg:Stamina">,
+	chart: ChartDocument<"itg:Stamina">
+): CalculatedData<"itg:Stamina"> {
+	// If the user failed -- and we don't know when, return null for everything.
+	if (dryScore.scoreData.lamp === "FAILED" && IsNullish(dryScore.scoreData.hitMeta.diedAt)) {
+		return {
+			blockRating: null,
+			highest32: null,
+			highest256: null,
+		};
+	}
+
+	return {
+		blockRating: chart.levelNum,
+		highest32: ITGHighestUnbroken.calculateFromNPSPerMeasure(
+			chart.data.breakdown.npsPerMeasure,
+			chart.data.breakdown.notesPerMeasure,
+			dryScore.scoreData.hitMeta.diedAt,
+			32
+		),
+		highest256: ITGHighestUnbroken.calculateFromNPSPerMeasure(
+			chart.data.breakdown.npsPerMeasure,
+			chart.data.breakdown.notesPerMeasure,
+			dryScore.scoreData.hitMeta.diedAt,
+			256
+		),
+	};
+}
diff --git a/server/src/lib/score-import/framework/sessions/calculated-data.ts b/server/src/lib/score-import/framework/sessions/calculated-data.ts
index 98731c01d..483de3a5c 100644
--- a/server/src/lib/score-import/framework/sessions/calculated-data.ts
+++ b/server/src/lib/score-import/framework/sessions/calculated-data.ts
@@ -1,6 +1,7 @@
 import type {
 	Game,
 	IDStrings,
+	integer,
 	Playtype,
 	ScoreDocument,
 	SessionCalculatedDataLookup,
@@ -9,20 +10,18 @@ import type {
 
 type ScoreCalculatedDataOnly = Pick<ScoreDocument, "calculatedData">;
 
-const RELEVANT_SCORES = 10;
-
-function AverageBest10(vals: Array<number | null | undefined>) {
+function AverageBestN(vals: Array<number | null | undefined>, n = 10) {
 	const numbers = vals.filter((e) => typeof e === "number") as Array<number>;
 
-	if (numbers.length < RELEVANT_SCORES) {
+	if (numbers.length < n) {
 		return null;
 	}
 
 	return (
 		numbers
 			.sort((a, b) => b - a)
-			.slice(0, RELEVANT_SCORES)
-			.reduce((a, e) => a + e, 0) / RELEVANT_SCORES
+			.slice(0, n)
+			.reduce((a, e) => a + e, 0) / n
 	);
 }
 
@@ -40,7 +39,21 @@ function AvgBest10Map(
 	arr: Array<ScoreCalculatedDataOnly>,
 	prop: keyof ScoreDocument["calculatedData"]
 ) {
-	return AverageBest10(arr.map((e) => e.calculatedData[prop]));
+	return AverageBestN(
+		arr.map((e) => e.calculatedData[prop]),
+		10
+	);
+}
+
+function AvgBestNMap(
+	arr: Array<ScoreCalculatedDataOnly>,
+	prop: keyof ScoreDocument["calculatedData"],
+	n: integer
+) {
+	return AverageBestN(
+		arr.map((e) => e.calculatedData[prop]),
+		n
+	);
 }
 
 type SessionCalcDataFn = (
@@ -107,6 +120,11 @@ function GetGPTSessionCalcDataFn(game: Game, playtype: Playtype): SessionCalcDat
 			});
 		case "maimai:Single":
 			return () => ({});
+		case "itg:Stamina":
+			return (scd) => ({
+				blockRating: AvgBestNMap(scd, "blockRating", 5),
+				average32Speed: AvgBestNMap(scd, "highest32", 5),
+			});
 	}
 }
 
diff --git a/server/src/lib/score-import/framework/user-game-stats/classes.ts b/server/src/lib/score-import/framework/user-game-stats/classes.ts
index 0a0811da9..865f4d835 100644
--- a/server/src/lib/score-import/framework/user-game-stats/classes.ts
+++ b/server/src/lib/score-import/framework/user-game-stats/classes.ts
@@ -67,6 +67,7 @@ const STATIC_CLASS_HANDLERS: ClassHandlerMap = {
 		Single: CalculateJubeatColour,
 	},
 	pms: null,
+	itg: null,
 };
 
 /**
diff --git a/server/src/lib/score-import/framework/user-game-stats/rating.ts b/server/src/lib/score-import/framework/user-game-stats/rating.ts
index d722172d5..0ad94f750 100644
--- a/server/src/lib/score-import/framework/user-game-stats/rating.ts
+++ b/server/src/lib/score-import/framework/user-game-stats/rating.ts
@@ -153,6 +153,13 @@ function GetGPTRatingFunction(game: Game, playtype: Playtype): RatingFunction {
 				jubility: await CalculateJubility(g, p, u, l),
 				naiveJubility: await LazySumN("jubility", 60)(g, p, u),
 			});
+		case "itg:Stamina":
+			// HighestX is equivalent to summing 1.
+			return async (g, p, u) => ({
+				highestBlock: await LazySumN("blockRating", 1, true)(g, p, u),
+				highest32: await LazySumN("highest32", 1, true)(g, p, u),
+				highest256: await LazySumN("highest256", 1, true)(g, p, u),
+			});
 	}
 }
 
diff --git a/server/src/lib/score-import/import-types/common/batch-manual/converter.ts b/server/src/lib/score-import/import-types/common/batch-manual/converter.ts
index bf68a85bd..f431c28bc 100644
--- a/server/src/lib/score-import/import-types/common/batch-manual/converter.ts
+++ b/server/src/lib/score-import/import-types/common/batch-manual/converter.ts
@@ -14,6 +14,7 @@ import {
 	FindChartWithPTDF,
 	FindChartWithPTDFVersion,
 	FindDDRChartOnSongHash,
+	FindITGChartOnHash,
 } from "utils/queries/charts";
 import { FindSongOnID, FindSongOnTitleInsensitive } from "utils/queries/songs";
 import type { DryScore } from "../../../framework/common/types";
@@ -172,6 +173,34 @@ export async function ResolveMatchTypeToKTData(
 			return { chart, song };
 		}
 
+		case "itgChartHash": {
+			if (game !== "itg") {
+				throw new InvalidScoreFailure(`Cannot use itgChartHash lookup on ${game}.`);
+			}
+
+			const chart = await FindITGChartOnHash(data.identifier);
+
+			if (!chart) {
+				throw new KTDataNotFoundFailure(
+					`Cannot find chart for itgChartHash ${data.identifier}.`,
+					importType,
+					data,
+					context
+				);
+			}
+
+			const song = await FindSongOnID(game, chart.songID);
+
+			if (!song) {
+				logger.severe(`ITG songID ${chart.songID} has charts but no parent song.`);
+				throw new InternalFailure(
+					`ITG songID ${chart.songID} has charts but no parent song.`
+				);
+			}
+
+			return { song, chart };
+		}
+
 		case "ddrSongHash": {
 			if (game !== "ddr") {
 				throw new InvalidScoreFailure(`Cannot use ddrSongHash lookup on ${game}.`);