diff --git a/AquaNet/.env b/AquaNet/.env.example
similarity index 65%
rename from AquaNet/.env
rename to AquaNet/.env.example
index 2c5fa305..c374df19 100644
--- a/AquaNet/.env
+++ b/AquaNet/.env.example
@@ -7,4 +7,10 @@ VITE_TURNSTILE_SITE_KEY=0x4AAAAAAASGA2KQEIelo9P9
 VITE_DISCORD_INVITE=https://discord.gg/FNgveqFF7s
 VITE_TELEGRAM_INVITE=https://t.me/+zBL4RZdyfvUzZGU1
 VITE_QQ_INVITE=https://qm.qq.com/q/dpYmGoVHnG
-VITE_GITHUB_REPOSITORY=https://github.com/MewoLab/AquaDX
\ No newline at end of file
+VITE_GITHUB_REPOSITORY=https://github.com/MewoLab/AquaDX
+
+# example:
+# https://aquadx.net/#accesskey=....
+VITE_ACCESSCODE_QKEY=accesskey
+
+VITE_DEFAULT_GAME=mai2
\ No newline at end of file
diff --git a/AquaNet/.gitignore b/AquaNet/.gitignore
index 69166fea..6deb399a 100644
--- a/AquaNet/.gitignore
+++ b/AquaNet/.gitignore
@@ -35,4 +35,6 @@ dist-ssr
 public/chu3
 
 # local env file
-*.local
\ No newline at end of file
+*.local
+
+.env
diff --git a/AquaNet/public/announcement.txt b/AquaNet/public/announcement.txt
new file mode 100644
index 00000000..e69de29b
diff --git a/AquaNet/src/App.svelte b/AquaNet/src/App.svelte
index 948ebb61..7ff3e1ae 100644
--- a/AquaNet/src/App.svelte
+++ b/AquaNet/src/App.svelte
@@ -9,7 +9,8 @@
   import Settings from "./pages/User/Settings.svelte";
   import MaiPhoto from "./pages/MaiPhoto.svelte";
   import { pfp, tooltip } from "./libs/ui"
-  import { ANNOUNCEMENT } from "./libs/config";
+  import { ANNOUNCEMENT } from "./libs/announcement";
+  import { DEFAULT_GAME } from "./libs/config"
   import { t } from "./libs/i18n";
   import Transfer from "./pages/Transfer/Transfer.svelte";
   import { link } from "d3";
@@ -34,7 +35,7 @@
   let me: AquaNetUser
   let playedMai = false
 
-  let recentGame: string = "mai2";
+  let recentGame: string = DEFAULT_GAME;
 
   if (USER.isLoggedIn())
   {
@@ -60,9 +61,9 @@
       <span>AquaNet</span>
     </a>
   {/if}
-  {#if ANNOUNCEMENT}
+  {#if $ANNOUNCEMENT}
     <div class="announcement">
-      <strong>{t('navigation.notice')}</strong>: {ANNOUNCEMENT}
+      <strong>{t('navigation.notice')}</strong>: {$ANNOUNCEMENT}
     </div>
   {/if}
   <a href="/home">{t('navigation.home').toLowerCase()}</a>
diff --git a/AquaNet/src/libs/acUrl.ts b/AquaNet/src/libs/acUrl.ts
new file mode 100644
index 00000000..9d79c7b9
--- /dev/null
+++ b/AquaNet/src/libs/acUrl.ts
@@ -0,0 +1,35 @@
+// card handler. for dealing user QR scan.
+// this will assumes that the link of the generated QR code in [access code]
+// page has been altered by modder to link to custom 
+
+import { ACCESSCODE_QKEY } from "./config";
+
+const query = new URLSearchParams(location.hash.slice(1));
+const lsKey = "acurl"
+
+export const url_has = (): boolean => query.has(ACCESSCODE_QKEY);
+export const get = (): string => localStorage.getItem(lsKey) || "";
+export const has = (): boolean => !!localStorage.getItem(lsKey);
+export const clear = (): void => localStorage.removeItem(lsKey);
+
+export function check() {
+    if (!url_has()) return
+
+    console.log("Found access code in URL. Saving.")
+    localStorage.setItem(lsKey, query.get(ACCESSCODE_QKEY) || "")
+}
+
+export function preview() {
+  const card = get()
+  const masked =
+    card.slice(0, 4) +
+    "x".repeat(card.length - 4);
+
+  return masked.match(/.{1,4}/g)?.join(" ");
+}
+
+export function previewR() {
+  const card = get()
+
+  return card.match(/.{1,4}/g)?.join(" ");
+}
\ No newline at end of file
diff --git a/AquaNet/src/libs/announcement.ts b/AquaNet/src/libs/announcement.ts
new file mode 100644
index 00000000..63b0f2ff
--- /dev/null
+++ b/AquaNet/src/libs/announcement.ts
@@ -0,0 +1,11 @@
+import { writable } from "svelte/store"
+
+export const ANNOUNCEMENT = writable('')
+
+// This task must not bother the existing one. Keep it async in the background instead
+void (async () => {
+  let r = await fetch("/announcement.txt")
+  if (!r.ok) return;
+
+  ANNOUNCEMENT.set(await r.text())
+})()
\ No newline at end of file
diff --git a/AquaNet/src/libs/config.ts b/AquaNet/src/libs/config.ts
index df32060b..a668266c 100644
--- a/AquaNet/src/libs/config.ts
+++ b/AquaNet/src/libs/config.ts
@@ -17,7 +17,8 @@ export const FADE_OUT = { duration: 200 }
 export const FADE_IN = { delay: 400 }
 export const DEFAULT_PFP = '/assets/imgs/no_profile.png'
 
-export const ANNOUNCEMENT = '' // If set, will add an announcement to the top bar. Keep it short.
+// Key name for access key scanned from QR code
+export const ACCESSCODE_QKEY = import.meta.env.VITE_ACCESSCODE_QKEY || "accesskey"
 
 // Documentation for Userbox mode can be found in `docs/aquabox-url-mode.md`
 // Please note that if this is set, it must be manually unset by users in Chuni Settings -> Update Userbox -> Switch to URL mode -> (empty value) -> Enter key
@@ -25,6 +26,8 @@ export const USERBOX_DEFAULT_URL = ""
 
 export const HAS_USERBOX_ASSETS = true
 
+export const DEFAULT_GAME = import.meta.env.VITE_DEFAULT_GAME || "mai2"
+
 // Meow meow meow
 
 // Matching servers
@@ -45,4 +48,4 @@ export const CHU3_MATCHINGS: ChusanMatchingOption[] = [
     reflector: "http://reflector.naominet.live:18080/",
     coop: ["RinNET", "MysteriaNET"],
   },
-]
+]
\ No newline at end of file
diff --git a/AquaNet/src/libs/i18n/en_ref.ts b/AquaNet/src/libs/i18n/en_ref.ts
index c0cadac9..a2eb5ab1 100644
--- a/AquaNet/src/libs/i18n/en_ref.ts
+++ b/AquaNet/src/libs/i18n/en_ref.ts
@@ -60,6 +60,7 @@ export const EN_REF_Welcome = {
   'welcome.verified': 'Your email has been verified! You can now log in now.',
   'welcome.verification-failed': 'Verification failed: ${message}. Please try again.',
   'welcome.password-reset-done': 'Your password has been updated! Please log back in.',
+  'welcome.login_link': 'Login / register to link your card.'
 }
 
 export const EN_REF_LEADERBOARD = {
diff --git a/AquaNet/src/pages/Home.svelte b/AquaNet/src/pages/Home.svelte
index c36f120c..681d6307 100644
--- a/AquaNet/src/pages/Home.svelte
+++ b/AquaNet/src/pages/Home.svelte
@@ -6,6 +6,7 @@
   import { t } from "../libs/i18n";
   import ImportDataAction from "./Home/ImportDataAction.svelte";
   import DashboardTabs from "../components/DashboardTabs.svelte";
+  import * as acUrl from "../libs/acUrl";
 
   USER.ensureLoggedIn();
 
@@ -13,6 +14,10 @@
   let error = "";
 
   USER.me().then((m) => me = m).catch(e => error = e.message)
+
+  if (acUrl.has()) {
+    location.href = "/cards"
+  }
 </script>
 
 <main class="content">
diff --git a/AquaNet/src/pages/Home/LinkCard.svelte b/AquaNet/src/pages/Home/LinkCard.svelte
index db1ad025..513e69a9 100644
--- a/AquaNet/src/pages/Home/LinkCard.svelte
+++ b/AquaNet/src/pages/Home/LinkCard.svelte
@@ -9,6 +9,8 @@
   import StatusOverlays from "../../components/StatusOverlays.svelte"
   import { t } from "../../libs/i18n"
   import DashboardTabs from "../../components/DashboardTabs.svelte";
+  import * as acUrl from "../../libs/acUrl"
+  import { ACCESSCODE_QKEY } from "../../libs/config";
 
   // State
   let state: 'ready' | 'linking-AC' | 'linking-SN' | 'loading' = "loading"
@@ -27,7 +29,10 @@
     // Always put the ghost card at the top
     m.cards.sort((a, b) => a.isGhost ? -1 : 1)
     state = "ready"
+
+    linkQR()
   }).catch(e => error = e.message)
+  acUrl.check()
   updateMe()
 
   // Data conflict overlay
@@ -273,6 +278,16 @@
     };
     inputACChange();
   }
+
+  function linkQR() {
+    if (!acUrl.has()) return;
+
+    inputAC = acUrl.get()
+    if (inputAC.length !== 20) return inputAC = "";
+
+    inputACChange()
+    acUrl.clear()
+  }
 </script>
 
 <main class="content">
diff --git a/AquaNet/src/pages/Ranking.svelte b/AquaNet/src/pages/Ranking.svelte
index c942835f..52269922 100644
--- a/AquaNet/src/pages/Ranking.svelte
+++ b/AquaNet/src/pages/Ranking.svelte
@@ -9,8 +9,9 @@
   import UserCard from "../components/UserCard.svelte";
   import Tooltip from "../components/Tooltip.svelte";
   import Cap from "./Ranking/Cap.svelte";
+  import { DEFAULT_GAME } from "../libs/config";
 
-  export let game: GameName = 'mai2';
+  export let game: GameName = DEFAULT_GAME;
 
   title(`Ranking`);
 
diff --git a/AquaNet/src/pages/Welcome.svelte b/AquaNet/src/pages/Welcome.svelte
index 9442fc57..0676cffd 100644
--- a/AquaNet/src/pages/Welcome.svelte
+++ b/AquaNet/src/pages/Welcome.svelte
@@ -6,6 +6,14 @@
   import { USER } from "../libs/sdk";
   import { t } from "../libs/i18n"
 
+  import * as acUrl from "../libs/acUrl"
+  const hasAc = acUrl.has()
+  let previewAc = ""
+
+  if (hasAc) {
+    previewAc = acUrl.preview() || ""
+  }
+
   let params = new URLSearchParams(window.location.search)
 
   let state = "home"
@@ -178,6 +186,13 @@
 <main id="home" class="no-margin">
   <div>
     <h1 id="title">AquaNet</h1>
+    <div id="welcome">
+    {#if hasAc}
+      <span>{t('welcome.login_link')}:</span><br>
+      <small>{previewAc}</small>
+    {/if}
+    </div>
+
     {#if state === "home"}
       <div class="btn-group" transition:slide>
         <button on:click={() => state = 'login'}>{t('welcome.btn-login')}</button>
@@ -329,6 +344,9 @@
       margin-bottom: 32px
       opacity: 0.9
 
+    #welcome
+      margin-bottom: 32px
+
     .btn-group
       display: flex
       gap: 8px