feat(frontend): add new game

5 files changed, 795 insertions, 4 deletions

diff --git a/packages/frontend/src/components/MkPlusOneEffect.vue b/packages/frontend/src/components/MkPlusOneEffect.vue
index a741a3f7a8..6feb85d8de 100644
--- a/packages/frontend/src/components/MkPlusOneEffect.vue
+++ b/packages/frontend/src/components/MkPlusOneEffect.vue
@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <div :class="$style.root" :style="{ zIndex, top: `${y - 64}px`, left: `${x - 64}px` }">
-	<span class="text" :class="{ up }">+1</span>
+	<span class="text" :class="{ up }">+{{ value }}</span>
 </div>
 </template>
 
@@ -16,7 +16,9 @@ import * as os from '@/os.js';
 const props = withDefaults(defineProps<{
 	x: number;
 	y: number;
+	value?: number;
 }>(), {
+	value: 1,
 });
 
 const emit = defineEmits<{
diff --git a/packages/frontend/src/pages/drop-and-fusion.vue b/packages/frontend/src/pages/drop-and-fusion.vue
new file mode 100644
index 0000000000..d0ca5157ef
--- /dev/null
+++ b/packages/frontend/src/pages/drop-and-fusion.vue
@@ -0,0 +1,761 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkStickyContainer>
+	<template #header><MkPageHeader/></template>
+	<MkSpacer :contentMax="800">
+		<div class="_gaps_s" :class="$style.root" style="margin: 0 auto;" :style="{ maxWidth: GAME_WIDTH + 'px' }">
+			<div style="display: flex;">
+				<div :class="$style.frame" style="flex: 1; margin-right: 10px;">
+					<div :class="$style.frameInner">
+						SCORE: <b><MkNumber :value="score"/></b>
+					</div>
+				</div>
+				<div :class="[$style.frame, $style.stock]" style="margin-left: auto;">
+					<div :class="$style.frameInner" style="text-align: center;">
+						NEXT >>>
+						<TransitionGroup
+							:enterActiveClass="$style.transition_stock_enterActive"
+							:leaveActiveClass="$style.transition_stock_leaveActive"
+							:enterFromClass="$style.transition_stock_enterFrom"
+							:leaveToClass="$style.transition_stock_leaveTo"
+							:moveClass="$style.transition_stock_move"
+						>
+							<div v-for="x in stock" :key="x.id" style="display: inline-block;">
+								<img :src="x.fruit.img" style="width: 32px;"/>
+							</div>
+						</TransitionGroup>
+					</div>
+				</div>
+			</div>
+			<div :class="$style.main">
+				<div ref="containerEl" :class="[$style.container, { [$style.gameOver]: gameOver }]" @click.stop.prevent="onClick" @touchmove="onTouchmove" @touchend="onTouchend" @mousemove="onMousemove">
+					<img src="/client-assets/drop-and-fusion/frame.svg" :class="$style.mainFrameImg"/>
+					<canvas ref="canvasEl" :class="$style.canvas"/>
+					<Transition
+						:enterActiveClass="$style.transition_combo_enterActive"
+						:leaveActiveClass="$style.transition_combo_leaveActive"
+						:enterFromClass="$style.transition_combo_enterFrom"
+						:leaveToClass="$style.transition_combo_leaveTo"
+						:moveClass="$style.transition_combo_move"
+					>
+						<div v-show="combo > 1" :class="$style.combo" :style="{ fontSize: `${100 + ((comboPrev - 2) * 15)}%` }">{{ comboPrev }} Chain!</div>
+					</Transition>
+					<Transition
+						:enterActiveClass="$style.transition_picked_enterActive"
+						:leaveActiveClass="$style.transition_picked_leaveActive"
+						:enterFromClass="$style.transition_picked_enterFrom"
+						:leaveToClass="$style.transition_picked_leaveTo"
+						:moveClass="$style.transition_picked_move"
+						mode="out-in"
+					>
+						<img v-if="currentPick" :key="currentPick.id" :src="currentPick?.fruit.img" :class="$style.currentFruit" :style="{ top: -(currentPick?.fruit.size / 2) + 'px', left: (mouseX - (currentPick?.fruit.size / 2)) + 'px', width: `${currentPick?.fruit.size}px` }"/>
+					</Transition>
+					<template v-if="dropReady">
+						<img src="/client-assets/drop-and-fusion/drop-arrow.svg" :class="$style.currentFruitArrow" :style="{ top: (currentPick?.fruit.size / 2) + 10 + 'px', left: (mouseX - 10) + 'px', width: `20px` }"/>
+						<div :class="$style.dropGuide" :style="{ left: (mouseX - 2) + 'px' }"/>
+					</template>
+					<div v-if="gameOver" :class="$style.gameOverLabel">
+						<div>GAME OVER!</div>
+						<div>SCORE: <MkNumber :value="score"/></div>
+					</div>
+				</div>
+			</div>
+			<MkButton @click="restart">Restart</MkButton>
+		</div>
+	</MkSpacer>
+</MkStickyContainer>
+</template>
+
+<script lang="ts" setup>
+import * as Matter from 'matter-js';
+import { Ref, onMounted, ref, shallowRef } from 'vue';
+import { EventEmitter } from 'eventemitter3';
+import { definePageMetadata } from '@/scripts/page-metadata.js';
+import * as sound from '@/scripts/sound.js';
+import MkRippleEffect from '@/components/MkRippleEffect.vue';
+import * as os from '@/os.js';
+import MkNumber from '@/components/MkNumber.vue';
+import MkPlusOneEffect from '@/components/MkPlusOneEffect.vue';
+import MkButton from '@/components/MkButton.vue';
+
+const containerEl = shallowRef<HTMLElement>();
+const canvasEl = shallowRef<HTMLCanvasElement>();
+const mouseX = ref(0);
+
+const BASE_SIZE = 30;
+const FRUITS = [{
+	id: '9377076d-c980-4d83-bdaf-175bc58275b7',
+	level: 10,
+	size: BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	score: 512,
+	available: false,
+	sfxPitch: 0.25,
+	img: '/client-assets/drop-and-fusion/exploding_head.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: 'be9f38d2-b267-4b1a-b420-904e22e80568',
+	level: 9,
+	size: BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	score: 256,
+	available: false,
+	sfxPitch: 0.5,
+	img: '/client-assets/drop-and-fusion/face_with_symbols_on_mouth.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: 'beb30459-b064-4888-926b-f572e4e72e0c',
+	level: 8,
+	size: BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	score: 128,
+	available: false,
+	sfxPitch: 0.75,
+	img: '/client-assets/drop-and-fusion/cold_face.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: 'feab6426-d9d8-49ae-849c-048cdbb6cdf0',
+	level: 7,
+	size: BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	score: 64,
+	available: false,
+	sfxPitch: 1,
+	img: '/client-assets/drop-and-fusion/zany_face.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: 'd6d8fed6-6d18-4726-81a1-6cf2c974df8a',
+	level: 6,
+	size: BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25 * 1.25,
+	score: 32,
+	available: false,
+	sfxPitch: 1.5,
+	img: '/client-assets/drop-and-fusion/pleading_face.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: '249c728e-230f-4332-bbbf-281c271c75b2',
+	level: 5,
+	size: BASE_SIZE * 1.25 * 1.25 * 1.25 * 1.25,
+	score: 16,
+	available: true,
+	sfxPitch: 2,
+	img: '/client-assets/drop-and-fusion/face_with_open_mouth.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: '23d67613-d484-4a93-b71e-3e81b19d6186',
+	level: 4,
+	size: BASE_SIZE * 1.25 * 1.25 * 1.25,
+	score: 8,
+	available: true,
+	sfxPitch: 2.5,
+	img: '/client-assets/drop-and-fusion/smiling_face_with_sunglasses.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: '3cbd0add-ad7d-4685-bad0-29f6dddc0b99',
+	level: 3,
+	size: BASE_SIZE * 1.25 * 1.25,
+	score: 4,
+	available: true,
+	sfxPitch: 3,
+	img: '/client-assets/drop-and-fusion/grinning_squinting_face.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: '8f86d4f4-ee02-41bf-ad38-1ce0ae457fb5',
+	level: 2,
+	size: BASE_SIZE * 1.25,
+	score: 2,
+	available: true,
+	sfxPitch: 3.5,
+	img: '/client-assets/drop-and-fusion/smiling_face_with_hearts.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}, {
+	id: '64ec4add-ce39-42b4-96cb-33908f3f118d',
+	level: 1,
+	size: BASE_SIZE,
+	score: 1,
+	available: true,
+	sfxPitch: 4,
+	img: '/client-assets/drop-and-fusion/heart_suit.png',
+	imgSize: 256,
+	spriteScale: 1.12,
+}] as const;
+
+const GAME_WIDTH = 450;
+const GAME_HEIGHT = 600;
+const PHYSICS_QUALITY_FACTOR = 32; // 低いほどパフォーマンスが高いがガタガタして安定しなくなる
+
+let viewScaleX = 1;
+let viewScaleY = 1;
+const currentPick = shallowRef<{ id: string; fruit: typeof FRUITS[number] } | null>(null);
+const stock = shallowRef<{ id: string; fruit: typeof FRUITS[number] }[]>([]);
+const score = ref(0);
+const combo = ref(0);
+const comboPrev = ref(0);
+const dropReady = ref(true);
+const gameOver = ref(false);
+const gameStarted = ref(false);
+
+class Game extends EventEmitter<{
+	changeScore: (score: number) => void;
+	changeCombo: (combo: number) => void;
+	changeStock: (stock: { id: string; fruit: typeof FRUITS[number] }[]) => void;
+	dropped: () => void;
+	fusioned: (x: number, y: number, score: number) => void;
+	gameOver: () => void;
+}> {
+	private COMBO_INTERVAL = 1000;
+	public readonly DROP_INTERVAL = 500;
+	private PLAYAREA_MARGIN = 25;
+	private engine: Matter.Engine;
+	private render: Matter.Render;
+	private runner: Matter.Runner;
+	private detector: Matter.Detector;
+	private overflowCollider: Matter.Body;
+	private isGameOver = false;
+
+	/**
+	 * フィールドに出ていて、かつ合体の対象となるアイテム
+	 */
+	private activeBodyIds: Matter.Body['id'][] = [];
+
+	private latestDroppedBodyId: Matter.Body['id'] | null = null;
+
+	private latestDroppedAt = 0;
+	private latestFusionedAt = 0;
+	private stock: { id: string; fruit: typeof FRUITS[number] }[] = [];
+
+	private _combo = 0;
+	private get combo() {
+		return this._combo;
+	}
+	private set combo(value: number) {
+		this._combo = value;
+		this.emit('changeCombo', value);
+	}
+
+	private _score = 0;
+	private get score() {
+		return this._score;
+	}
+	private set score(value: number) {
+		this._score = value;
+		this.emit('changeScore', value);
+	}
+
+	constructor() {
+		super();
+
+		this.engine = Matter.Engine.create({
+			constraintIterations: 2 * PHYSICS_QUALITY_FACTOR,
+			positionIterations: 6 * PHYSICS_QUALITY_FACTOR,
+			velocityIterations: 4 * PHYSICS_QUALITY_FACTOR,
+			gravity: {
+				x: 0,
+				y: 1,
+			},
+			timing: {
+				timeScale: 2,
+			},
+			enableSleeping: false,
+		});
+
+		this.render = Matter.Render.create({
+			engine: this.engine,
+			canvas: canvasEl.value,
+			options: {
+				width: GAME_WIDTH,
+				height: GAME_HEIGHT,
+				background: 'transparent', // transparent to hide
+				wireframeBackground: 'transparent', // transparent to hide
+				wireframes: false,
+				showSleeping: false,
+				pixelRatio: window.devicePixelRatio,
+			},
+		});
+
+		Matter.Render.run(this.render);
+
+		this.runner = Matter.Runner.create();
+		Matter.Runner.run(this.runner, this.engine);
+
+		this.detector = Matter.Detector.create();
+
+		this.engine.world.bodies = [];
+
+		//#region walls
+		const WALL_OPTIONS: Matter.IChamferableBodyDefinition = {
+			isStatic: true,
+			render: {
+				strokeStyle: 'transparent',
+				fillStyle: 'transparent',
+			},
+		};
+
+		const thickness = 100;
+		Matter.Composite.add(this.engine.world, [
+			Matter.Bodies.rectangle(GAME_WIDTH / 2, GAME_HEIGHT + (thickness / 2) - this.PLAYAREA_MARGIN, GAME_WIDTH, thickness, WALL_OPTIONS),
+			Matter.Bodies.rectangle(GAME_WIDTH + (thickness / 2) - this.PLAYAREA_MARGIN, GAME_HEIGHT / 2, thickness, GAME_HEIGHT, WALL_OPTIONS),
+			Matter.Bodies.rectangle(-((thickness / 2) - this.PLAYAREA_MARGIN), GAME_HEIGHT / 2, thickness, GAME_HEIGHT, WALL_OPTIONS),
+		]);
+		//#endregion
+
+		this.overflowCollider = Matter.Bodies.rectangle(GAME_WIDTH / 2, 0, GAME_WIDTH, 125, {
+			isStatic: true,
+			isSensor: true,
+			render: {
+				strokeStyle: 'transparent',
+				fillStyle: 'transparent',
+			},
+		});
+		Matter.Composite.add(this.engine.world, this.overflowCollider);
+
+		// fit the render viewport to the scene
+		Matter.Render.lookAt(this.render, {
+			min: { x: 0, y: 0 },
+			max: { x: GAME_WIDTH, y: GAME_HEIGHT },
+		});
+	}
+
+	private createBody(fruit: typeof FRUITS[number], x: number, y: number) {
+		return Matter.Bodies.circle(x, y, fruit.size / 2, {
+			label: fruit.id,
+			density: 0.0005,
+			frictionAir: 0.01,
+			restitution: 0.4,
+			friction: 0.5,
+			frictionStatic: 5,
+			//mass: 0,
+			render: {
+				sprite: {
+					texture: fruit.img,
+					xScale: (fruit.size / fruit.imgSize) * fruit.spriteScale,
+					yScale: (fruit.size / fruit.imgSize) * fruit.spriteScale,
+				},
+			},
+		});
+	}
+
+	private fusion(bodyA: Matter.Body, bodyB: Matter.Body) {
+		const now = Date.now();
+		if (this.latestFusionedAt > now - this.COMBO_INTERVAL) {
+			this.combo++;
+		} else {
+			this.combo = 1;
+		}
+		this.latestFusionedAt = now;
+
+		// TODO: 単に位置だけでなくそれぞれの動きベクトルも融合する
+		const newX = (bodyA.position.x + bodyB.position.x) / 2;
+		const newY = (bodyA.position.y + bodyB.position.y) / 2;
+
+		Matter.Composite.remove(this.engine.world, [bodyA, bodyB]);
+		this.activeBodyIds = this.activeBodyIds.filter(x => x !== bodyA.id && x !== bodyB.id);
+
+		const currentFruit = FRUITS.find(y => y.id === bodyA.label)!;
+		const nextFruit = FRUITS.find(x => x.level === currentFruit.level + 1);
+
+		if (nextFruit) {
+			const body = this.createBody(nextFruit, newX, newY);
+			Matter.Composite.add(this.engine.world, body);
+
+			// 連鎖してfusionした場合の分かりやすさのため少し間を置いてからfusion対象になるようにする
+			window.setTimeout(() => {
+				this.activeBodyIds.push(body.id);
+			}, 100);
+
+			const additionalScore = Math.round(currentFruit.score * (1 + (this.combo / 3)));
+			this.score += additionalScore;
+
+			const pan = ((newX / GAME_WIDTH) - 0.5) * 2;
+			sound.playRaw('syuilo/bubble2', 1, pan, nextFruit.sfxPitch);
+
+			this.emit('fusioned', newX, newY, additionalScore);
+		} else {
+			//const VELOCITY = 30;
+			//for (let i = 0; i < 10; i++) {
+			//	const body = createBody(FRUITS.find(x => x.level === (1 + Math.floor(Math.random() * 3)))!, x + ((Math.random() * VELOCITY) - (VELOCITY / 2)), y + ((Math.random() * VELOCITY) - (VELOCITY / 2)));
+			//	Matter.Composite.add(world, body);
+			//	bodies.push(body);
+			//}
+			//sound.playRaw({
+			//	type: 'syuilo/bubble2',
+			//	volume: 1,
+			//});
+		}
+	}
+
+	private gameOver() {
+		this.isGameOver = true;
+		Matter.Runner.stop(this.runner);
+		this.emit('gameOver');
+	}
+
+	public start() {
+		for (let i = 0; i < 4; i++) {
+			this.stock.push({
+				id: Math.random().toString(),
+				fruit: FRUITS.filter(x => x.available)[Math.floor(Math.random() * FRUITS.filter(x => x.available).length)],
+			});
+		}
+		this.emit('changeStock', this.stock);
+
+		// TODO: fusion予約状態のアイテムは光らせるなどの演出をすると楽しそう
+		let fusionReservedPairs: { bodyA: Matter.Body; bodyB: Matter.Body }[] = [];
+
+		const minCollisionDepthForSound = 2.5;
+		const maxCollisionDepthForSound = 9;
+		const soundPitchMax = 4;
+		const soundPitchMin = 0.5;
+
+		Matter.Events.on(this.engine, 'collisionStart', (event) => {
+			for (const pairs of event.pairs) {
+				const { bodyA, bodyB } = pairs;
+				if (bodyA.id === this.overflowCollider.id || bodyB.id === this.overflowCollider.id) {
+					if (bodyA.id === this.latestDroppedBodyId || bodyB.id === this.latestDroppedBodyId) {
+						continue;
+					}
+					this.gameOver();
+					break;
+				}
+				const shouldFusion = (bodyA.label === bodyB.label) && !fusionReservedPairs.some(x => x.bodyA.id === bodyA.id || x.bodyA.id === bodyB.id || x.bodyB.id === bodyA.id || x.bodyB.id === bodyB.id);
+				if (shouldFusion) {
+					if (this.activeBodyIds.includes(bodyA.id) && this.activeBodyIds.includes(bodyB.id)) {
+						this.fusion(bodyA, bodyB);
+					} else {
+						fusionReservedPairs.push({ bodyA, bodyB });
+						window.setTimeout(() => {
+							fusionReservedPairs = fusionReservedPairs.filter(x => x.bodyA.id !== bodyA.id && x.bodyB.id !== bodyB.id);
+							this.fusion(bodyA, bodyB);
+						}, 100);
+					}
+				} else {
+					const energy = pairs.collision.depth;
+					if (energy > minCollisionDepthForSound) {
+						const vol = (Math.min(maxCollisionDepthForSound, energy - minCollisionDepthForSound) / maxCollisionDepthForSound) / 4;
+						const pan = ((((bodyA.position.x + bodyB.position.x) / 2) / GAME_WIDTH) - 0.5) * 2;
+						const pitch = soundPitchMin + ((soundPitchMax - soundPitchMin) * (1 - (Math.min(10, energy) / 10)));
+						sound.playRaw('syuilo/poi1', vol, pan, pitch);
+					}
+				}
+			}
+		});
+
+		window.setInterval(() => {
+			if (this.latestFusionedAt < Date.now() - this.COMBO_INTERVAL) {
+				this.combo = 0;
+			}
+		}, 500);
+	}
+
+	public drop(_x: number) {
+		if (this.isGameOver) return;
+		if (Date.now() - this.latestDroppedAt < this.DROP_INTERVAL) {
+			return;
+		}
+		const st = this.stock.shift()!;
+		this.stock.push({
+			id: Math.random().toString(),
+			fruit: FRUITS.filter(x => x.available)[Math.floor(Math.random() * FRUITS.filter(x => x.available).length)],
+		});
+		this.emit('changeStock', this.stock);
+
+		const x = Math.min(GAME_WIDTH - this.PLAYAREA_MARGIN - (st.fruit.size / 2), Math.max(this.PLAYAREA_MARGIN + (st.fruit.size / 2), _x));
+		const body = this.createBody(st.fruit, x, st.fruit.size / 2);
+		Matter.Composite.add(this.engine.world, body);
+		this.activeBodyIds.push(body.id);
+		this.latestDroppedBodyId = body.id;
+		this.latestDroppedAt = Date.now();
+		this.emit('dropped');
+		const pan = ((x / GAME_WIDTH) - 0.5) * 2;
+		sound.playRaw('syuilo/poi2', 1, pan);
+	}
+
+	public dispose() {
+		Matter.Render.stop(this.render);
+		Matter.Runner.stop(this.runner);
+		Matter.World.clear(this.engine.world, false);
+		Matter.Engine.clear(this.engine);
+	}
+}
+
+let game: Game;
+
+function onClick(ev: MouseEvent) {
+	const rect = containerEl.value.getBoundingClientRect();
+
+	const x = (ev.clientX - rect.left) / viewScaleX;
+
+	game.drop(x);
+}
+
+function onTouchend(ev: TouchEvent) {
+	const rect = containerEl.value.getBoundingClientRect();
+
+	const x = (ev.changedTouches[0].clientX - rect.left) / viewScaleX;
+
+	game.drop(x);
+}
+
+function onMousemove(ev: MouseEvent) {
+	mouseX.value = ev.clientX - containerEl.value.getBoundingClientRect().left;
+}
+
+function onTouchmove(ev: TouchEvent) {
+	mouseX.value = ev.touches[0].clientX - containerEl.value.getBoundingClientRect().left;
+}
+
+function restart() {
+	game.dispose();
+	gameOver.value = false;
+	currentPick.value = null;
+	dropReady.value = true;
+	stock.value = [];
+	score.value = 0;
+	combo.value = 0;
+	comboPrev.value = 0;
+	game = new Game();
+	attachGame();
+	game.start();
+}
+
+function attachGame() {
+	game.addListener('changeScore', value => {
+		score.value = value;
+	});
+
+	game.addListener('changeCombo', value => {
+		if (value === 0) {
+			comboPrev.value = combo.value;
+		} else {
+			comboPrev.value = value;
+		}
+		combo.value = value;
+	});
+
+	game.addListener('changeStock', value => {
+		currentPick.value = JSON.parse(JSON.stringify(value[0]));
+		stock.value = JSON.parse(JSON.stringify(value.slice(1)));
+	});
+
+	game.addListener('dropped', () => {
+		dropReady.value = false;
+		window.setTimeout(() => {
+			if (!gameOver.value) {
+				dropReady.value = true;
+			}
+		}, game.DROP_INTERVAL);
+	});
+
+	game.addListener('fusioned', (x, y, score) => {
+		const rect = canvasEl.value.getBoundingClientRect();
+		const domX = rect.left + (x * viewScaleX);
+		const domY = rect.top + (y * viewScaleY);
+		os.popup(MkRippleEffect, { x: domX, y: domY }, {}, 'end');
+		os.popup(MkPlusOneEffect, { x: domX, y: domY, value: score }, {}, 'end');
+	});
+
+	game.addListener('gameOver', () => {
+		currentPick.value = null;
+		dropReady.value = false;
+		gameOver.value = true;
+	});
+}
+
+onMounted(() => {
+	game = new Game();
+
+	attachGame();
+
+	game.start();
+
+	const actualCanvasWidth = canvasEl.value.getBoundingClientRect().width;
+	const actualCanvasHeight = canvasEl.value.getBoundingClientRect().height;
+	viewScaleX = actualCanvasWidth / GAME_WIDTH;
+	viewScaleY = actualCanvasHeight / GAME_HEIGHT;
+});
+
+definePageMetadata({
+	title: 'Drop & Fusion',
+	icon: 'ti ti-apple',
+});
+</script>
+
+<style lang="scss" module>
+.transition_stock_move,
+.transition_stock_enterActive,
+.transition_stock_leaveActive {
+	transition: opacity 0.4s cubic-bezier(0,.5,.5,1), transform 0.4s cubic-bezier(0,.5,.5,1) !important;
+}
+.transition_stock_enterFrom,
+.transition_stock_leaveTo {
+	opacity: 0;
+	transform: scale(0.7);
+}
+.transition_stock_leaveActive {
+	position: absolute;
+}
+
+.transition_picked_move,
+.transition_picked_enterActive {
+	transition: opacity 0.5s cubic-bezier(0,.5,.5,1), transform 0.5s cubic-bezier(0,.5,.5,1) !important;
+}
+.transition_picked_leaveActive {
+	transition: all 0s !important;
+}
+.transition_picked_enterFrom,
+.transition_picked_leaveTo {
+	opacity: 0;
+	transform: translateY(-50px);
+}
+.transition_picked_leaveActive {
+	position: absolute;
+}
+
+.transition_combo_move,
+.transition_combo_enterActive {
+	transition: all 0s !important;
+}
+.transition_combo_leaveActive {
+	transition: opacity 0.4s cubic-bezier(0,.5,.5,1), transform 0.4s cubic-bezier(0,.5,.5,1) !important;
+}
+.transition_combo_enterFrom,
+.transition_combo_leaveTo {
+	opacity: 0;
+	transform: scale(0.7);
+}
+.transition_combo_leaveActive {
+	position: absolute;
+}
+
+.root {
+	user-select: none;
+
+	* {
+		user-select: none;
+	}
+}
+
+.frame {
+	padding: 7px;
+	background: #8C4F26;
+	box-shadow: 0 6px 16px #0007, 0 0 1px 1px #693410, inset 0 0 2px 1px #ce8a5c;
+	border-radius: 10px;
+}
+.frameInner {
+	padding: 4px 8px;
+	background: #F1E8DC;
+	box-shadow: 0 0 2px 1px #ce8a5c, inset 0 0 1px 1px #693410;
+	border-radius: 6px;
+	color: #693410;
+}
+
+.main {
+	position: relative;
+}
+
+.mainFrameImg {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	filter: drop-shadow(0 6px 16px #0007);
+	pointer-events: none;
+	user-select: none;
+}
+
+.canvas {
+	position: relative;
+	display: block;
+	z-index: 1;
+	margin-top: -50px;
+	max-width: 100%;
+	pointer-events: none;
+	user-select: none;
+}
+
+.container {
+	position: relative;
+}
+
+.stock {
+	pointer-events: none;
+	user-select: none;
+}
+
+.combo {
+	position: absolute;
+	z-index: 3;
+	top: 50%;
+	width: 100%;
+	text-align: center;
+	font-weight: bold;
+	font-style: oblique;
+	pointer-events: none;
+	user-select: none;
+}
+
+.currentFruit {
+	position: absolute;
+	margin-top: 20px;
+	z-index: 2;
+	filter: drop-shadow(0 6px 16px #0007);
+	pointer-events: none;
+	user-select: none;
+}
+
+.currentFruitArrow {
+	position: absolute;
+	margin-top: 20px;
+	z-index: 3;
+	animation: currentFruitArrow 2s ease infinite;
+	pointer-events: none;
+	user-select: none;
+}
+
+.dropGuide {
+	position: absolute;
+	top: 50px;
+	z-index: 3;
+	width: 3px;
+	height: calc(100% - 50px);
+	background: #f002;
+	pointer-events: none;
+	user-select: none;
+}
+
+.gameOverLabel {
+	position: absolute;
+	z-index: 10;
+	top: 50%;
+	width: 100%;
+	padding: 16px;
+	box-sizing: border-box;
+	background: #0007;
+	color: #fff;
+	text-align: center;
+	font-weight: bold;
+}
+
+.gameOver {
+	.canvas {
+		filter: grayscale(1);
+	}
+}
+
+@keyframes currentFruitArrow {
+	0% { transform: translateY(0); }
+	25% { transform: translateY(-8px); }
+	50% { transform: translateY(0); }
+	75% { transform: translateY(-8px); }
+	100% { transform: translateY(0); }
+}
+</style>
diff --git a/packages/frontend/src/router.ts b/packages/frontend/src/router.ts
index baee85866c..9cf4be778c 100644
--- a/packages/frontend/src/router.ts
+++ b/packages/frontend/src/router.ts
@@ -528,6 +528,10 @@ export const routes = [{
 	component: page(() => import('./pages/clicker.vue')),
 	loginRequired: true,
 }, {
+	path: '/drop-and-fusion',
+	component: page(() => import('./pages/drop-and-fusion.vue')),
+	loginRequired: true,
+}, {
 	path: '/timeline',
 	component: page(() => import('./pages/timeline.vue')),
 }, {
diff --git a/packages/frontend/src/scripts/sound.ts b/packages/frontend/src/scripts/sound.ts
index 0b966ff199..acde78f5fd 100644
--- a/packages/frontend/src/scripts/sound.ts
+++ b/packages/frontend/src/scripts/sound.ts
@@ -92,7 +92,13 @@ export type OperationType = typeof operationTypes[number];
  * @param soundStore サウンド設定
  * @param options `useCache`: デフォルトは`true` 一度再生した音声はキャッシュする
  */
-export async function loadAudio(soundStore: SoundStore, options?: { useCache?: boolean; }) {
+export async function loadAudio(soundStore: {
+	type: Exclude<SoundType, '_driveFile_'>;
+} | {
+	type: '_driveFile_';
+	fileId: string;
+	fileUrl: string;
+}, options?: { useCache?: boolean; }) {
 	if (_DEV_) console.log('loading audio. opts:', options);
 	// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 	if (soundStore.type === null || (soundStore.type === '_driveFile_' && !soundStore.fileUrl)) {
@@ -179,18 +185,31 @@ export async function playFile(soundStore: SoundStore) {
 	createSourceNode(buffer, soundStore.volume)?.start();
 }
 
-export function createSourceNode(buffer: AudioBuffer, volume: number) : AudioBufferSourceNode | null {
+export async function playRaw(type: Exclude<SoundType, '_driveFile_'>, volume = 1, pan = 0, playbackRate = 1) {
+	const buffer = await loadAudio({ type });
+	if (!buffer) return;
+	createSourceNode(buffer, volume, pan, playbackRate)?.start();
+}
+
+export function createSourceNode(buffer: AudioBuffer, volume: number, pan = 0, playbackRate = 1) : AudioBufferSourceNode | null {
 	const masterVolume = defaultStore.state.sound_masterVolume;
 	if (isMute() || masterVolume === 0 || volume === 0) {
 		return null;
 	}
 
+	const panNode = ctx.createStereoPanner();
+	panNode.pan.value = pan;
+
 	const gainNode = ctx.createGain();
 	gainNode.gain.value = masterVolume * volume;
 
 	const soundSource = ctx.createBufferSource();
 	soundSource.buffer = buffer;
-	soundSource.connect(gainNode).connect(ctx.destination);
+	soundSource.playbackRate.value = playbackRate;
+	soundSource
+		.connect(panNode)
+		.connect(gainNode)
+		.connect(ctx.destination);
 
 	return soundSource;
 }
diff --git a/packages/frontend/src/ui/_common_/common.ts b/packages/frontend/src/ui/_common_/common.ts
index b970ff1df4..e50002dc2c 100644
--- a/packages/frontend/src/ui/_common_/common.ts
+++ b/packages/frontend/src/ui/_common_/common.ts
@@ -27,6 +27,11 @@ function toolsMenuItems(): MenuItem[] {
 		to: '/clicker',
 		text: '🍪👈',
 		icon: 'ti ti-cookie',
+	}, {
+		type: 'link',
+		to: '/drop-and-fusion',
+		text: 'Drop & Fusion',
+		icon: 'ti ti-apple',
 	}, ($i && ($i.isAdmin || $i.policies.canManageCustomEmojis)) ? {
 		type: 'link',
 		to: '/custom-emojis-manager',