This CalculaGames variant has 4,096 cells and the usual 16 pieces per side. W 1–8 selects one 8 × 8 × 8 slice; switching slices never uses a turn. Green cubes are legal moves and red cubes are captures. Drag to look around and zoom to separate overlapping cubes.

Rook: any distance along one axis. Bishop: equal distances along exactly two axes. Queen: equal distances along any combination of axes. Knight: two steps along one axis and one along another, jumping over pieces. King: one step along any combination of axes; never into check.

Pawn: one empty step forward in Y or W. To capture, move one step forward and one sideways along X or Z, or one step forward in both Y and W. White advances toward Y8/W8; Black toward Y1/W1. Pawns promote automatically to queens when they reach both far Y and W edges. No double-step, en passant, or castling. Checkmate wins; stalemate, threefold repetition, or 100 half-moves without a pawn move or capture draws.

Keyboard: arrows move the cube cursor in X/Z, Page Up/Down changes Y, Enter selects. Slice buttons change W. Home resets the view. Rooms follow the shared temporary-session rules; there is no match archive or public matchmaking.