diff --git a/packages/frontend/src/pages/drop-and-fusion.game.vue b/packages/frontend/src/pages/drop-and-fusion.game.vue
index a8fa953c38..9531147061 100644
--- a/packages/frontend/src/pages/drop-and-fusion.game.vue
+++ b/packages/frontend/src/pages/drop-and-fusion.game.vue
@@ -220,7 +220,7 @@ const NORAML_MONOS: FrontendMonoDefinition[] = [{
 	img: '/client-assets/drop-and-fusion/normal_monos/face_with_symbols_on_mouth.png',
 	imgSizeX: 256,
 	imgSizeY: 256,
-	spriteScale: 1.12,
+	spriteScale: 1.0,
 }, {
 	id: 'beb30459-b064-4888-926b-f572e4e72e0c',
 	sfxPitch: 0.75,
@@ -494,9 +494,81 @@ const SWEETS_MONOS: FrontendMonoDefinition[] = [{
 	imgSizeY: 32,
 	spriteScale: 1,
 }];
+const PRISMISSKEY_MONOS: FrontendMonoDefinition[] = [{
+	id: 'f75fd0ba-d3d4-40a4-9712-b470e45b0525',
+	sfxPitch: 0.25,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2Fc4c7e430-bd92-415a-a7d3-031ddb7f0641.apng',
+	imgSizeX: 3400,
+	imgSizeY: 3400,
+	spriteScale: 2.3,
+}, {
+	id: '7b70f4af-1c01-45fd-af72-61b1f01e03d1',
+	sfxPitch: 0.5,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2F5ba71ab2-1673-4eb0-bd3b-b44e063365ba.apng',
 
+	imgSizeX: 2000,
+	imgSizeY: 2000,
+	spriteScale: 1.65,
+}, {
+	id: '41607ef3-b6d6-4829-95b6-3737bf8bb956',
+	sfxPitch: 0.75,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2Fd6fe438b-c550-484f-95d1-1739a2b5173d.apng',
+
+	imgSizeX: 2000,
+	imgSizeY: 2000,
+	spriteScale: 1.8,
+}, {
+	id: '8a8310d2-0374-460f-bb50-ca9cd3ee3416',
+	sfxPitch: 1,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2F8226211b-58e2-46ba-be20-4ea635d614ab.webp',
+	imgSizeX: 500,
+	imgSizeY: 501,
+	spriteScale: 1.0,
+}, {
+	id: '1092e069-fe1a-450b-be97-b5d477ec398c',
+	sfxPitch: 1.5,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2Fde30a66c-5c98-4c2e-a425-4d1f73d96899.png',
+	imgSizeX: 340,
+	imgSizeY: 351,
+	spriteScale: 0.98,
+}, {
+	id: '2294734d-7bb8-4781-bb7b-ef3820abf3d0',
+	sfxPitch: 2,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2Fdc8d893a-6d1f-4a86-847e-a30e56270249.png',
+	imgSizeX: 1023,
+	imgSizeY: 1000,
+	spriteScale: 1.0,
+}, {
+	id: 'ea8a61af-e350-45f7-ba6a-366fcd65692a',
+	sfxPitch: 2.5,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2F56a303b9-4385-44bb-a4d4-2453450eef01.png',
+	imgSizeX: 256,
+	imgSizeY: 256,
+	spriteScale: 0.4,
+}, {
+	id: 'd0c74815-fc1c-4fbe-9953-c92e4b20f919',
+	sfxPitch: 3,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2F96a87c60-543d-4e83-a24d-c2a3247eb2ea.webp',
+	imgSizeX: 630,
+	imgSizeY: 620,
+	spriteScale: 0.6,
+}, {
+	id: 'd8fbd70e-611d-402d-87da-1a7fd8cd2c8d',
+	sfxPitch: 3.5,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2Fdff2812b-2c80-4ecf-b5f1-b2874048899e.webp',
+	imgSizeX: 1500,
+	imgSizeY: 1500,
+	spriteScale: 1.15,
+}, {
+	id: '35e476ee-44bd-4711-ad42-87be245d3efd',
+	sfxPitch: 4,
+	img: '/proxy/image.webp?url=https%3A%2F%2Ffiles.prismisskey.space%2Fmisskey%2Fc4448bf6-d95f-49e5-844d-b6b9530e82cc.png',
+	imgSizeX: 200,
+	imgSizeY: 200,
+	spriteScale: 1.5,
+}];
 const props = defineProps<{
-	gameMode: 'normal' | 'square' | 'yen' | 'sweets';
+	gameMode: 'normal' | 'square' | 'yen' | 'sweets' | 'prismisskey';
 	mute: boolean;
 }>();
 
@@ -509,6 +581,7 @@ const monoDefinitions = computed(() => {
 		props.gameMode === 'square' ? SQUARE_MONOS :
 		props.gameMode === 'yen' ? YEN_MONOS :
 		props.gameMode === 'sweets' ? SWEETS_MONOS :
+		props.gameMode === 'prismisskey' ? PRISMISSKEY_MONOS :
 		[] as never;
 });
 
@@ -517,6 +590,7 @@ function getScoreUnit(gameMode: string) {
 		gameMode === 'square' ? 'pt' :
 		gameMode === 'yen' ? '円' :
 		gameMode === 'sweets' ? 'kcal' :
+		gameMode === 'prismisskey' ? 'pt' :
 		'' as never;
 }
 
diff --git a/packages/frontend/src/pages/drop-and-fusion.vue b/packages/frontend/src/pages/drop-and-fusion.vue
index 18d3f56ca2..00a2dfe292 100644
--- a/packages/frontend/src/pages/drop-and-fusion.vue
+++ b/packages/frontend/src/pages/drop-and-fusion.vue
@@ -28,6 +28,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 								<option value="square">SQUARE</option>
 								<option value="yen">YEN</option>
 								<option value="sweets">SWEETS</option>
+                                <option value="prismisskey">PRISMISSKEY</option>
 							</MkSelect>
 							<MkButton primary gradate large rounded inline @click="start">{{ i18n.ts.start }}</MkButton>
 						</div>
@@ -94,7 +95,7 @@ import MkSelect from '@/components/MkSelect.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import { misskeyApiGet } from '@/scripts/misskey-api.js';
 
-const gameMode = ref<'normal' | 'square' | 'yen' | 'sweets'>('normal');
+const gameMode = ref<'normal' | 'square' | 'yen' | 'sweets' | 'prismisskey'>('normal');
 const gameStarted = ref(false);
 const mute = ref(false);
 const ranking = ref(null);
@@ -108,6 +109,7 @@ function getScoreUnit(gameMode: string) {
 		gameMode === 'square' ? 'pt' :
 		gameMode === 'yen' ? '円' :
 		gameMode === 'sweets' ? 'kcal' :
+            gameMode === 'prismisskey' ? 'pt' :
 		'' as never;
 }
 
diff --git a/packages/frontend/src/scripts/drop-and-fusion-engine.ts b/packages/frontend/src/scripts/drop-and-fusion-engine.ts
index 7c75822a20..4378bef5e4 100644
--- a/packages/frontend/src/scripts/drop-and-fusion-engine.ts
+++ b/packages/frontend/src/scripts/drop-and-fusion-engine.ts
@@ -976,7 +976,301 @@ const SWEETS_MONOS: Mono[] = [{
 	score: 30,
 	dropCandidate: true,
 }];
+const PRISMISSKEY_BASE_SIZE = 28;
 
+const PRISMISSKEY_MONOS: Mono[] = [{
+	id: 'f75fd0ba-d3d4-40a4-9712-b470e45b0525',
+	level: 10,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	shape: 'custom',
+	vertices: [[
+		{ 'x': 1680, 'y': 270 },
+		{ 'x': 2150, 'y': 560 },
+		{ 'x': 2600, 'y': 910 },
+		{ 'x': 3279, 'y': 650 },
+		{ 'x': 3130, 'y': 1100 },
+		{ 'x': 2750, 'y': 1250 },
+		{ 'x': 2800, 'y': 1860 },
+		{ 'x': 1760, 'y': 1980 },
+		{ 'x': 1500, 'y': 1840 },
+		{ 'x': 989, 'y': 1800 },
+		{ 'x': 888, 'y': 1900 },
+		{ 'x': 688, 'y': 1540 },
+		{ 'x': 783, 'y': 1250 },
+		{ 'x': 660, 'y': 1190 },
+		{ 'x': 600, 'y': 800 },
+		{ 'x': 722, 'y': 382 },
+		{ 'x': 1100, 'y': 835 },
+		{ 'x': 1400, 'y': 670 },
+	]],
+	verticesSize: 1800,
+	score: 512,
+	dropCandidate: false,
+}, {
+	id: '7b70f4af-1c01-45fd-af72-61b1f01e03d1',
+	level: 9,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	shape: 'custom',
+	vertices: [
+		[
+			{ 'x': 1023, 'y': 266 },
+			{ 'x': 1476, 'y': 474 },
+			{ 'x': 1595, 'y': 362 },
+			{ 'x': 1747, 'y': 359 },
+			{ 'x': 1939, 'y': 481 },
+			{ 'x': 1769, 'y': 700 },
+			{ 'x': 1666, 'y': 690 },
+			{ 'x': 1711, 'y': 982 },
+			{ 'x': 1638, 'y': 1227 },
+			{ 'x': 1494, 'y': 1300 },
+			{ 'x': 1037, 'y': 1300 },
+			{ 'x': 914, 'y': 1183 },
+			{ 'x': 447, 'y': 1200 },
+			{ 'x': 290, 'y': 1300 },
+			{ 'x': 204, 'y': 1280 },
+			{ 'x': 170, 'y': 835 },
+			{ 'x': 321, 'y': 523 },
+			{ 'x': 647, 'y': 323 },
+			{ 'x': 857, 'y': 277 },
+
+		],
+	],
+	verticesSize: 1300,
+	score: 256,
+	dropCandidate: false,
+}, {
+	id: '41607ef3-b6d6-4829-95b6-3737bf8bb956',
+	level: 8,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	shape: 'custom',
+	vertices: [
+		[
+			{ 'x': 1177, 'y': 85 },
+			{ 'x': 1498, 'y': 404 },
+			{ 'x': 1370, 'y': 374 },
+			{ 'x': 1737, 'y': 619 },
+			{ 'x': 1946, 'y': 721 },
+			{ 'x': 1764, 'y': 975 },
+			{ 'x': 1674, 'y': 949 },
+			{ 'x': 1715, 'y': 1183 },
+			{ 'x': 1641, 'y': 1498 },
+			{ 'x': 1479, 'y': 1555 },
+			{ 'x': 1008, 'y': 1566 },
+			{ 'x': 912, 'y': 1447 },
+			{ 'x': 456, 'y': 1453 },
+			{ 'x': 298, 'y': 1561 },
+			{ 'x': 240, 'y': 1551 },
+			{ 'x': 187, 'y': 1017 },
+			{ 'x': 283, 'y': 825 },
+			{ 'x': 517, 'y': 609 },
+			{ 'x': 187, 'y': 1017 },
+			{ 'x': 352, 'y': 521 },
+			{ 'x': 821, 'y': 333 },
+		],
+	],
+	verticesSize: 1300,
+	score: 128,
+	dropCandidate: false,
+}, {
+	id: '8a8310d2-0374-460f-bb50-ca9cd3ee3416',
+	level: 7,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	shape: 'circle',
+	score: 64,
+	dropCandidate: false,
+}, {
+	id: '1092e069-fe1a-450b-be97-b5d477ec398c',
+	level: 6,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	shape: 'circle',
+	score: 32,
+	dropCandidate: false,
+}, {
+	id: '2294734d-7bb8-4781-bb7b-ef3820abf3d0',
+	level: 5,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25,
+
+	shape: 'custom',
+	vertices: [
+		[
+			{
+				'x': 410,
+				'y': 14,
+			},
+			{
+				'x': 741,
+				'y': 160,
+			},
+			{
+				'x': 834,
+				'y': 346,
+			},
+			{
+				'x': 853,
+				'y': 637,
+			},
+			{
+				'x': 768,
+				'y': 760,
+			},
+			{
+				'x': 422,
+				'y': 813,
+			},			{
+				'x': 66,
+				'y': 748,
+			},
+			{
+				'x': 27,
+				'y': 702,
+			},
+			{
+				'x': 7,
+				'y': 543,
+			}, {
+				'x': 63,
+				'y': 263,
+			},	{
+				'x': 170,
+				'y': 108,
+			},
+			{
+				'x': 310,
+				'y': 26,
+			},
+		],
+	],
+	verticesSize: 1024,
+	score: 16,
+	dropCandidate: true,
+}, {
+	id: 'ea8a61af-e350-45f7-ba6a-366fcd65692a',
+	level: 4,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25 * 1.25,
+	shape: 'rectangle',
+	score: 8,
+	dropCandidate: true,
+}, {
+	id: 'd0c74815-fc1c-4fbe-9953-c92e4b20f919',
+	level: 3,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25 * 1.25,
+
+	shape: 'custom',
+	vertices: [
+		[
+			{
+				'x': 87,
+				'y': 6,
+			},
+			{
+				'x': 169,
+				'y': 53,
+			},
+			{
+				'x': 169,
+				'y': 147,
+			},
+			{
+				'x': 87,
+				'y': 195,
+			},
+			{
+				'x': 6,
+				'y': 147,
+			},
+			{
+				'x': 6,
+				'y': 53,
+			},
+		],
+	],
+	verticesSize: 128,
+	score: 4,
+	dropCandidate: true,
+}, {
+	id: 'd8fbd70e-611d-402d-87da-1a7fd8cd2c8d',
+	level: 2,
+	sizeX: PRISMISSKEY_BASE_SIZE * 1.25,
+	sizeY: PRISMISSKEY_BASE_SIZE * 1.25,
+
+	shape: 'custom',
+	vertices: [
+		[
+			{
+				'x': 749,
+				'y': 12,
+			},
+			{
+				'x': 1386,
+				'y': 379,
+			},
+			{
+				'x': 1387,
+				'y': 1116,
+			},
+			{
+				'x': 749,
+				'y': 1484,
+			},
+			{
+				'x': 111,
+				'y': 1116,
+			},
+			{
+				'x': 111,
+				'y': 380,
+			},
+		],
+	],
+	verticesSize: 1536,
+	score: 2,
+	dropCandidate: true,
+}, {
+	id: '35e476ee-44bd-4711-ad42-87be245d3efd',
+	level: 1,
+	sizeX: PRISMISSKEY_BASE_SIZE,
+	sizeY: PRISMISSKEY_BASE_SIZE,
+	shape: 'custom',
+	vertices: [
+		[
+			{
+				'x': 87,
+				'y': 6,
+			},
+			{
+				'x': 169,
+				'y': 53,
+			},
+			{
+				'x': 169,
+				'y': 147,
+			},
+			{
+				'x': 87,
+				'y': 195,
+			},
+			{
+				'x': 6,
+				'y': 147,
+			},
+			{
+				'x': 6,
+				'y': 53,
+			},
+		],
+	],
+	verticesSize: 128,
+	score: 1,
+	dropCandidate: true,
+}];
 export class DropAndFusionGame extends EventEmitter<{
 	changeScore: (newScore: number) => void;
 	changeCombo: (newCombo: number) => void;
@@ -1003,7 +1297,7 @@ export class DropAndFusionGame extends EventEmitter<{
 	private tickCallbackQueue: { frame: number; callback: () => void; }[] = [];
 	private overflowCollider: Matter.Body;
 	private isGameOver = false;
-	private gameMode: 'normal' | 'yen' | 'square' | 'sweets';
+	private gameMode: 'normal' | 'yen' | 'square' | 'sweets' | 'prismisskey';
 	private rng: () => number;
 	private logs: Log[] = [];
 
@@ -1031,6 +1325,7 @@ export class DropAndFusionGame extends EventEmitter<{
 			case 'yen': return YEN_MONOS;
 			case 'square': return SQUARE_MONOS;
 			case 'sweets': return SWEETS_MONOS;
+			case 'prismisskey': return PRISMISSKEY_MONOS;
 		}
 	}
 
@@ -1268,7 +1563,7 @@ export class DropAndFusionGame extends EventEmitter<{
 		for (let i = 0; i < this.STOCK_MAX; i++) {
 			this.stock.push({
 				id: this.rng().toString(),
-				mono: this.monoDefinitions.filter(x => x.dropCandidate)[Math.floor(this.rng() * this.monoDefinitions.filter(x => x.dropCandidate).length)],
+				mono: this.monoDefinitions[7],
 			});
 		}
 		this.emit('changeStock', this.stock);