Your turn: place a stone (4 left)
Teeko is a two-player abstract strategy game invented by John Scarne in 1937. Each side has four pieces and there are two different ways to win, which is what gives the game its unusual depth for something you can learn in under a minute. This version plays against an AI on a 6×6 board, at five difficulty levels, in the browser with nothing to install.
The game has two phases. In the placement phase, you and the AI take turns putting one piece on any empty square until each side has placed all four. You move first.
Once all eight pieces are down, the movement phase begins: each turn you slide one of your own pieces to an adjacent empty square, in any of the eight directions. Because pieces keep moving, the position never locks up — there is always something to play.
You win by getting your four pieces into either a straight line of four, in any direction, or a 2×2 square. Both count, and both are always available, which is why Teeko rewards setting up two threats at once.
If the same position occurs three times, the game is a draw. You are warned one repetition ahead, and the draw can be undone, since that position is still live.
The rules are standard, but the board is 6×6 rather than 5×5. Classic 5×5 Teeko has been solved — with perfect play the first player wins — so a 5×5 game against a strong AI would not be worth playing. 6×6 keeps the same two win conditions without the known solution.
No. That is the point of the movement phase: pieces can always be repositioned, so a full board is never a dead end the way it is in tic-tac-toe.
There are five levels. They differ by how deeply the AI searches and how often it plays a plausible second-best move, never by making it play randomly — even the easiest level takes an immediate win if you offer one.
No. There is no signup, no login, and nothing is sent to a server — the game runs entirely in your browser.