Seven polycubes — one 3×3×3 cube with 240 solutions
Drag to rotate • Click "Auto-Solve" to watch pieces placed • Select a piece to highlight it
The Soma cube was invented by Piet Hein in 1933 during a lecture by Werner Heisenberg. It consists of 7 polycubes: one L-tromino (3 cubes, non-collinear), three L-tetrominoes (4 cubes), two T-tetrominoes, and one S-tetromino. Together they fill exactly a 3×3×3 cube. There are exactly 240 essentially different solutions. Drag to rotate the 3D view. Auto-Solve animates a backtracking search placing pieces one by one.