Soma Cubes

Soma cubes are 3D puzzles that consist of 7 unique pieces, each made up of cubes.

The 7 pieces can be fit together to form a 3x3x3 cube, with 240 possible solutions.

The soma cube was invented in 1933 by the Danish inventor, Piet Hein during a lecture on quantum mechanics given by Werner Heisenberg.

Here are some hints

One of the 240 solutions

GeoGebra has a great 3D visualization that shows exploded views of all 240 solutions.