גְבִיָה: Soma Cube Puzzles

The Soma Cube is seven pieces made of unit cubes that assemble into a 3x3x3 block. Piet Hein worked it out in 1933 during a lecture on quantum mechanics. There are 240 distinct solutions, which sounds generous until you try to find one.

What makes Soma worth owning is that it never really ends. Once you find a solution you start building the figures - the tower, the sofa, the dog - and then you meet the variants that use the same seven pieces against a much harder goal.

The standard set and what comes after

Cube Alchemy and Soma Flop are the approachable entries. Ochinai Soma puts the same pieces inside a restricted opening, which removes most of the freedom you are used to.

Shrinking Soma by Dr. Volker Latussek is the expert end: standard Soma pieces into a 4x4x4 space, sealed, and stable enough that the finished cube will not shift when you shake it. Most people who have solved every classic Soma figure still lose an afternoon to it.

Best for

Solvers who already own a plain Soma Cube and want the next rung. Maths and engineering teachers who use polycubes to teach volume and spatial reasoning. Parents looking for a puzzle a ten-year-old and an adult can both work on.

Frequently Asked Questions

What is a Soma Cube?

A dissection puzzle of seven polycube pieces - one three-cube piece and six four-cube pieces - that combine into a 3x3x3 cube. It was invented by the Danish designer Piet Hein in 1933.

How many solutions does the Soma Cube have?

240, not counting rotations and reflections. Finding your first one is the hard part. After that you start noticing the patterns.

What makes an anti-slide Soma harder?

A standard Soma is solved when the pieces fill the space. An anti-slide version also requires that no piece can move once assembled, which rules out the large majority of ordinary solutions.