Free browser chess with three modes: 4D chess on a 4x4x2x2 hypercube board, classic chess on a rotatable 3D board vs Stockfish, and experimental 5D time-travel chess. Play vs the computer or a friend on the same device. No download, no sign-up.
Mouse or touch: click a piece, then a highlighted square. Play vs the computer or two players on one device.
Chess4D was submitted to SlowDen by Minh Tieu. SlowDen did not make this game - it is published here from the developer's own submission, added on 2026-10-27. It runs in the browser with no download, no install and no sign-up.