A free tic-tac-toe game — play it in your browser, no install. Mobile-first tic-tac-toe — local, AI (minimax), and online multiplayer via Firebase. PWA with offline play, dark mode, and accessibility.
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Controls: Local — pick two avatars, take turns, Play Again
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Open the live demo Source on GitHub⚔ This or That: Tic-tac-toe games
Mobile-first tic-tac-toe: local, AI, and online with friends.
Keyboard board/emoji navigation, ARIA labels and live regions, focus management, prefers-reduced-motion, 44px targets, safe-area insets.
Local — pick two avatars, take turns, Play Again.
Computer — pick your avatar and difficulty, then play the AI.
Online — pick an avatar → Create Room → share the link; your friend opens it and Join Room.
Vanilla HTML/CSS/JS (no build step). Firebase Realtime Database + Anonymous Auth (lazy). Canvas for win line and confetti. Web Audio for SFX.
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