Algodoo

Squares learn how to move forward by spinning and using evolution

The top squares are selected to reproduce and move onto the next generation

If a new square is very different from its parent in stats, it becomes a new species

The green graph shows the record of the top sqaure, and the yellow shows Species ID of the top 1, which tends to be higher the more erratic the square.

For fun, you may adjust the "_statMutationRate" or the "_spinMutationRate" of the starting square.