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A free browser strategy game that reinvents tic-tac-toe: every turn you place a mark and expand the board by one square, so the grid keeps growing throughout the match.
Place your mark in any open square, then grow the board by one square edge-to-edge against any existing square. There are always exactly four empty squares, so the board never fills up — no draws by exhaustion.
Yes — no download, no signup, no account. Just open the page and play.
Five difficulty tiers, Easy through Grandmaster, powered by an alpha-beta search engine that runs in a Web Worker so the page never freezes.
Yes — quick match against a random opponent, or send a friend an invite link. Peer-to-peer WebRTC, no game server.
A live evaluation panel with best line and alternatives, plus a post-game review with accuracy scores and move-quality badges.
The match begins with 4 empty squares arranged in a compact 2×2 block.
On your turn, place your mark (X or O) into any currently available empty square.
Immediately grow the board by adding one new empty square edge-to-edge against any existing cell.
Align 3 of your marks horizontally, vertically, or diagonally anywhere on the grid to win!
Rating 1200 — stored on this device only.
Player X connected 3 in a row!