Bacterial Invasion is a level-based puzzle game in which you are a bacterium infecting a human body. Or rather, sort of; the analogy inspires the design, but this is no sim. "Infection" doesn't mean breeding wildly in vivo and outspawning the immune system; instead, it apparently means finding the spawn points for leucocytes and "infecting" them, at which point the game transitions to the next level.
...when you Log In or Register. Gives you the ability to post to the forums and your own blog; to rate games and receive recommendations based on your ratings; and to bookmark games for later reference.