4D Chess: New Dimension

Chess beyond one board.

Four connected boards. One shared game. Discover a spatial chess variant where familiar pieces move through four dimensions.

LEARN BY MAKING A MOVE
Start with a simple rook move. Guided lessons and movement labs introduce coordinates, connected spaces and moves beyond a single board. Explore 102 puzzles across five learning levels, including spatial challenges that connect 2D, 3D and 4D views. Practise captures, forks and promotion, and build a daily streak. Free players receive a set of three puzzles: unfinished puzzles stay available, and the next set opens the day after all three are solved. Retries within the current set are free.

ONE POSITION. THREE PERSPECTIVES.
Read flat boards, explore the 3D view or rotate a 4D projection. Zoom in on one board, keep nearby spaces in view or compare two planes. On iPad, use flat and spatial views side by side. On an open iPhone Duo, play on linked flat and spatial boards and swap their sides while keeping your position.

PLAY YOUR WAY
Play offline against an on-device computer opponent or take turns with a friend on one device. No account is needed for offline play. Explore compact openings, a full army on 96 squares and an experimental four-space 8×8 board with 256 squares.

PLAY ONLINE
Create a private room, join with a code or QR scan, or find another player seeking a game. Online games use the compact board and offer untimed play or 5 or 10 minutes per player. Online play requires an app account; Apple, Google and guest sign-in are available. Recent online games can be revisited while they remain available.

THINK BEFORE YOU MOVE
Quick helper lets you rehearse a move before committing. Core games, online play, replay, basic analysis and existing lessons remain free.

GO FURTHER WITH FOURFOLD PLUS
An optional monthly or yearly auto-renewing subscription unlocks Full helper with one possible opponent reply, deeper match analysis, additional saved-position reviews and personal practice, unlimited access to all puzzles, all advanced 4D Academy exercises, and study notes, collections and insights. Study is stored on your device. Free Study includes one new completed review per day and three new practice exercises per week. Saved work is retained if Plus expires.

Analysis is a bounded search suggestion, not a guarantee of the best move or a prediction of winning chances. Demonstrations and