[Arkcon]

The biohazard powerup causes that. But it just lets you kill cells, the infected cell doesn't release new viruses. So its a poor simulation of virus action. But anyway, its just a "catch the falling object" game, played upwards instead of downwards, with moving obstacles.

A tip I've heard, but haven't really exploited, is to wait with one rbc left, to see if you can score more powerups. Upgrades become very expensive after 4 level.

I'm gonna go play now. This game is addictive.