Swimbots

Occasionally one runs across a simulation that is so fun to watch that it's marketed as a game. One such is Gene Pool. You may have seen this famous video of simulated swimming block creatures. Now you can evolve your own in 2D!

Update: version 3 uses simple block shapes, while version 4 genes control the creation and motion of whole limbs on the swimbots. Personally, I think version 3 is more interesting, but only version 4 allows people to share swimbot dna. (Even so, the save file dialog sucks.)

If any of you have actually bothered to try this out or would like to jumpstart your gene pool with a few evolved swimbots, here are some. I'll add more as they evolve, since I haven't been able to find any through Google.