RoboWar. 5
RoboWar is a strategy game. Yes it is free. The goal of the game is to make your robot kill all other robots and be the alone survivor. To do this you must program a robot in RoboWar's own language which is easy to learn.
The possibilities are endless with 28 different options of hardware for your robot. That is aside from the actual programming which is NEVER the same. There are tournaments held to put your robot(s) to the test.


Code:
http://rapidshare.com/files/266067824/RoboWar5.exe

2020