diff --git a/src/lib/games/quantum-tictactoe/AiApp.svelte b/src/lib/games/quantum-tictactoe/AiApp.svelte
new file mode 100644
index 0000000..c367a4a
--- /dev/null
+++ b/src/lib/games/quantum-tictactoe/AiApp.svelte
@@ -0,0 +1,227 @@
+<!--
+	QuantumTicTacToe is made by Rohan Pandit in 2017 and changed by Shouhei Uechi in 2021.
+	  Copyright (C) 2021  Shouhei Uechi
+	  Copyright (C) 2017  Rohan Pandit, available at <https://github.com/rohanp/QuantumTicTacToe/tree/master/>
+
+	This file is part of QuantumTicTacToe.
+
+	QuantumTicTacToe is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	QuantumTicTacToe is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QuantumTicTacToe.  If not, see <https://www.gnu.org/licenses/>.
+-->
+<script lang="ts">
+import type { MaxLengthArray } from '$lib/types/generics';
+import { getRandomInt } from '$lib/utils/getRandomInt';
+import { getOrdinal } from '$lib/utils/getNumeral';
+import { sleep } from '$lib/utils/sleep';
+
+import GameBoard from './GameBoard.svelte';
+import GameInfo from './GameInfo.svelte';
+import type { MarkType, SquareType } from './QuantumTTT.type';
+import Game from './QuantumTTT';
+
+let game = new Game();
+let gameCount = 1;
+
+let state = game.state;
+let message = state.status;
+
+$: choices =
+	state.collapseSquare !== null && state.cycleMarks !== null
+		? ((state.qSquares[state.collapseSquare] as Exclude<MaxLengthArray<MarkType, 9>, []>).filter(
+				(choice) => (state.cycleMarks as Exclude<typeof state.cycleMarks, []>).includes(choice)
+			) as MaxLengthArray<MarkType, 3> | undefined)
+		: undefined;
+
+const handleSquareClick = (i: SquareType): void => {
+	if (game.state.isOver) return;
+	const isPlayerMove = game.whoseTurn() === 'X' && !state.cycleSquares;
+	const isPlayerResolvableCollapse =
+		game.whoseTurn() === 'Y' && state.cycleSquares && state.cycleSquares.length > 0;
+	if (isPlayerMove || isPlayerResolvableCollapse) {
+		const status = game.handleSquareClick(i);
+
+		if (import.meta.env.DEV) console.table(game.state);
+		state = { ...game.state };
+		message = status;
+	} else {
+		message = 'AI is thinking!';
+		return;
+	}
+
+	const isAIResolvableCollapse =
+		game.whoseTurn() === 'X' && state.cycleSquares && state.cycleSquares.length > 0;
+	if (isAIResolvableCollapse) {
+		message = 'AI is thinking...';
+		sleep(1200)
+			.then(async () => {
+				await aiResolveCollapse();
+				await sleep(700);
+
+				if (game.state.isOver) {
+					message = game.state.status;
+					return;
+				}
+
+				message = 'AI is thinking...';
+				await sleep(1200);
+				aiMove();
+				return;
+			})
+			.catch((err) => {
+				console.error(err);
+			});
+		return;
+	}
+
+	const isAIMove = game.whoseTurn() === 'Y' && !state.cycleSquares;
+	if (isAIMove) {
+		message = 'AI is thinking...';
+		sleep(1200)
+			.then(() => {
+				aiMove();
+			})
+			.catch((err) => {
+				console.error(err);
+			});
+	}
+	return;
+};
+
+const aiMove = (): void => {
+	let cSquares: MaxLengthArray<SquareType, 9> = [];
+	for (let i = 0; i < 9; i++) {
+		if (state.cSquares[i] !== null) cSquares = [...cSquares, i as SquareType];
+	}
+	const aiMove1 = getRandomInt({ min: 0, max: 8, excepts: cSquares }) as SquareType;
+	const aiMove2 = getRandomInt({ min: 0, max: 8, excepts: [...cSquares, aiMove1] }) as SquareType;
+	game.handleSquareClick(aiMove1);
+
+	const status = game.handleSquareClick(aiMove2);
+	state = { ...game.state };
+	message = status;
+	return;
+};
+
+const aiResolveCollapse = async (): Promise<void> => {
+	if (state.cycleSquares != null) {
+		const randomInt = getRandomInt({ min: 0, max: state.cycleSquares.length - 1 });
+		const aiChoiceSquare = state.cycleSquares[randomInt];
+		game.handleSquareClick(aiChoiceSquare);
+		state = { ...game.state };
+	}
+
+	message = 'AI is thinking...';
+	await sleep(1200);
+	if (choices === undefined) return;
+	const aiChoiceMark = choices[getRandomInt({ min: 0, max: choices.length - 1 })];
+	game.handleCollapse(aiChoiceMark);
+	state = { ...game.state };
+
+	message = 'AI resolved collapse!';
+	return;
+};
+
+const handleCollapse = (mark: MarkType): void => {
+	const isPlayerResolvableCollapse = game.whoseTurn() === 'Y';
+	if (!isPlayerResolvableCollapse) return;
+
+	const status = game.handleCollapse(mark);
+
+	state = { ...game.state };
+	message = status;
+	return;
+};
+
+const handleNextGameClick = (): void => {
+	game = new Game();
+	game.setState({ scores: { ...state.scores } });
+	gameCount += 1;
+
+	state = { ...game.state };
+	message = `The ${getOrdinal(gameCount)} game!\n${game.state.status}`;
+	return;
+};
+
+const handleResetGameClick = (): void => {
+	game = new Game();
+	gameCount = 1;
+
+	state = { ...game.state };
+	message = game.state.status;
+	return;
+};
+</script>
+
+<div class="game">
+	<GameBoard
+		cSquares={state.cSquares}
+		qSquares={state.qSquares}
+		cycleSquares={state.cycleSquares}
+		cycleMarks={state.cycleMarks}
+		collapseSquare={state.collapseSquare}
+		onSquareClick={handleSquareClick}
+	/>
+	<GameInfo
+		{choices}
+		status={message}
+		isGameOver={state.isOver}
+		scores={state.scores}
+		onChoiceClick={handleCollapse}
+		onNextGameClick={handleNextGameClick}
+		onResetGameClick={handleResetGameClick}
+	/>
+</div>
+<div class="game-footer">
+	<p>
+		<small>
+			<a rel="license" href="https://www.gnu.org/licenses/">GNU Public Licensed</a>
+		</small>
+	</p>
+	<p>
+		<small>
+			QuantumTicTacToe is written by Rohan Pandit in 2017 and changed by Shouhei Uechi in 2021.
+		</small>
+		<br />
+		<small>
+			Copyright &copy; 2021
+			<a rel="author" href="https://github.com/u-sho">Shouhei Uechi</a>. Rights reserved.
+		</small>
+		<br />
+		<small>
+			Copyright &copy; 2017 Rohan Pandit, available at
+			<a href="https://github.com/rohanp/QuantumTicTacToe/tree/master/">his GitHub repository</a>.
+		</small>
+	</p>
+</div>
+
+<style lang="scss">
+.game {
+	display: flex;
+	flex-direction: row;
+	justify-content: center;
+	flex-wrap: wrap;
+	margin-top: 50px;
+}
+
+.game-footer {
+	width: 100%;
+	margin-top: 50px;
+	text-align: center;
+	background-color: var(--theme-color);
+	color: var(--bg-color);
+	a {
+		color: var(--bg-light-color);
+		text-decoration-line: underline;
+	}
+}
+</style>
diff --git a/src/lib/utils/getRandomInt.ts b/src/lib/utils/getRandomInt.ts
new file mode 100644
index 0000000..4799287
--- /dev/null
+++ b/src/lib/utils/getRandomInt.ts
@@ -0,0 +1,49 @@
+type GetRandomInt = (prop: { min?: number; max: number; excepts?: number[] }) => number;
+
+const getRandomInt: GetRandomInt = ({ min, max, excepts }) => {
+	if (min === undefined) min = 0;
+	if (!Number.isInteger(min) || !Number.isInteger(max))
+		console.error('getRandomInt: arguments min and max should be integers.');
+
+	if (max < min) console.error('getRandomInt: argument max should be greater than min.');
+
+	if (excepts && !Array.isArray(excepts))
+		console.error('getRandomInt: argument excepts should be an array.');
+	if (excepts && Array.isArray(excepts)) {
+		while (excepts.includes(min)) min++;
+		while (excepts.includes(max)) max--;
+		if (max < min)
+			console.error(
+				'getRandomInt: range [min, max] must have at least one integer not included in excepts.'
+			);
+	}
+
+	let ret = Math.floor(Math.random() * (max - min + 1)) + min;
+	while (excepts && Array.isArray(excepts) && excepts.includes(ret))
+		ret = Math.floor(Math.random() * (max - min + 1)) + min;
+
+	return ret;
+};
+
+export { getRandomInt };
+
+// test
+if (import.meta.vitest) {
+	const { test, expect } = import.meta.vitest;
+	test('getRandomInt', () => {
+		const min = 1;
+		const max = 10;
+		const n = getRandomInt({ min, max });
+		expect(n).toBeGreaterThanOrEqual(min);
+		expect(n).toBeLessThanOrEqual(max);
+	});
+	test('getRandomInt with excepts', () => {
+		const min = 1;
+		const max = 10;
+		const excepts = [1, 2, 3, 8, 10];
+		const n = getRandomInt({ min, max, excepts });
+		expect(n).toBeGreaterThanOrEqual(4);
+		expect(n).toBeLessThanOrEqual(9);
+		expect(excepts.includes(n)).toBe(false);
+	});
+}
diff --git a/src/lib/utils/sleep.ts b/src/lib/utils/sleep.ts
new file mode 100644
index 0000000..414dfc7
--- /dev/null
+++ b/src/lib/utils/sleep.ts
@@ -0,0 +1,16 @@
+const sleep = async (ms: number): Promise<void> =>
+	new Promise((resolve) => setTimeout(resolve, ms));
+
+export { sleep };
+
+// test
+if (import.meta.vitest) {
+	const { test, expect } = import.meta.vitest;
+	test('sleep', async () => {
+		const sleepTime = 100;
+		const start = Date.now();
+		await sleep(sleepTime);
+		const end = Date.now();
+		expect(end - start).toBeGreaterThanOrEqual(sleepTime);
+	});
+}
diff --git a/src/routes/games/quantum-tictactoe/+page.svelte b/src/routes/games/quantum-tictactoe/+page.svelte
index 40b023d..052376e 100644
--- a/src/routes/games/quantum-tictactoe/+page.svelte
+++ b/src/routes/games/quantum-tictactoe/+page.svelte
@@ -19,6 +19,10 @@ let footerHeight: number;
 				>チュートリアル</a
 			>
 		</li>
+		<li>
+			<a class="btn" href="/games/quantum-tictactoe/play/ai" type="application/ecmascript">AI対局</a
+			>
+		</li>
 		<li>
 			<a class="btn" href="/games/quantum-tictactoe/play/human" type="application/ecmascript"
 				>オフライン対局</a
diff --git a/src/routes/games/quantum-tictactoe/play/ai/+page.svelte b/src/routes/games/quantum-tictactoe/play/ai/+page.svelte
new file mode 100644
index 0000000..5b14db3
--- /dev/null
+++ b/src/routes/games/quantum-tictactoe/play/ai/+page.svelte
@@ -0,0 +1,33 @@
+<script lang="ts">
+import AiApp from '$lib/games/quantum-tictactoe/AiApp.svelte';
+</script>
+
+<svelte:head>
+	<link rel="canonical" href="https://qgame.app/games/quantum-tictactoe/play/human" />
+	<title>Quantum Tic-Tac-Toe - Quantum Game Arena</title>
+	<meta property="og:url" content="https://qgame.app/games/quantum-tictactoe/play/human" />
+	<meta property="og:title" content="Quantum Tic-Tac-Toe - Quantum Game Arena" />
+</svelte:head>
+
+<main class="main">
+	<!-- <SvelteDipper /> -->
+	<h1 class="title">Quantum Tic-Tac-Toe</h1>
+	<AiApp />
+</main>
+
+<style lang="scss">
+.main {
+	width: 100%;
+	height: 100%;
+	min-height: calc(100svh - var(--header-height));
+	padding-top: var(--header-height);
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+	justify-content: space-between;
+}
+
+.title {
+	text-align: center;
+}
+</style>
diff --git a/static/sitemap.xml b/static/sitemap.xml
index 7236442..8e53a4c 100644
--- a/static/sitemap.xml
+++ b/static/sitemap.xml
@@ -9,7 +9,7 @@
 
 	<url>
 		<loc>https://qgame.app/games/quantum-tictactoe</loc>
-		<lastmod>2022-09-29</lastmod>
+		<lastmod>2024-05-04</lastmod>
 		<changefreq>yearly</changefreq>
 		<priority>0.8</priority>
 	</url>
@@ -20,6 +20,13 @@
 		<changefreq>yearly</changefreq>
 	</url>
 
+	<url>
+		<loc>https://qgame.app/games/quantum-tictactoe/play/ai</loc>
+		<lastmod>2024-05-04</lastmod>
+		<changefreq>monthly</changefreq>
+		<priority>1.0</priority>
+	</url>
+
 	<url>
 		<loc>https://qgame.app/games/quantum-tictactoe/play/human</loc>
 		<lastmod>2023-12-22</lastmod>