Small and simple cubes with no exterior moving parts can propel themselves forward, jump on top of each other, and snap together to form arbitrary shapes.
M-Blocks are robots cube-shaped, with no external moving parts. But they are able to propel themselves by means of a flywheel inside them. Such flywheel can reach speeds of 20,000 revolutions per minute. When the flywheel is braked, it imparts its angular momentum to the cube. The M-Block is surface is surrounded by permanent magnets that allow any two cubes to attach to each other.
The only problem I can see is a matter of precision in their movements.
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