4 × 4 × 2 × 2. Sixty-four squares, four axes.
Chess with a fourth direction.
One click, 10 minutes, free. Want a different clock, colour, level or piece set? Choose your options · Learn the rules
A demo game is playing. Drag the tesseract to rotate it, scroll to zoom, or tap a piece on the flat boards to take over.
Four boards make one tesseract. A rook slides from one board to the same square on the next; your king can be in check from a piece in the other cube. Play people or the computer, free, no account needed.
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Play online
Bullet, blitz, rapid, classical and daily games. Rated with Glicko-2, or casual.
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Play the computer
Four levels, from a pawn that blunders to a queen that searches four plies deep.
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Puzzles
Mate in one and two across the boards, rated so they keep pace with you. Plus Puzzle Rush.
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Tournaments
Hourly arenas. Join late, get paired the moment you are free, streak for double points.
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Learn
From 3D to 4D in four steps, with every piece's reach lit up on a live board.
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Analysis board
Set up any position, try both sides, and ask the engine what it thinks.
Top blitz players Full leaderboard →
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How 4D chess works
Every square has four coordinates: file (X), rank (Y), which board column (Z) and which board row (W). The four 4×4 boards on screen are one 4×4×2×2 hypercube. A rook changes exactly one coordinate, a bishop exactly two by the same amount, a queen any set, the king one step on any combination, and a knight jumps two on X or Y and one on another axis.
That is the whole trick. Moving a rook from a1 on the bottom-left board to a1 on the top-left board is a straight move along W. Two lines that cross in the 3D projection do not share a square. Checkmate wins; there is no castling, en passant or double pawn push.
Learn the rules