Ichor

The beauty of is the simplicity of its structure. It immediately becomes obvious that if you touch the other color, you lose, and the goal is to cause opponents to touch your color. Basic movement keys represent the totality of the player input (mouse for single player, keyboard for two-player duels). Its a very straightforward setup.

The actual experience of playing is much more complex, though. There are numerous strategies for attacking enemies. You need to be keenly aware of the fluids behavior. Aligning yourself upstream from an opponent and moving with a current will be much more effective than blindly bum rushing the nearest target. I found that, over time, my awareness of the fluids state became more complete and useful in making second-to-second decisions.

http://img502.imageshack.us/img502/9172/ichor1.jpg