The objective is to keep your organism alive and to get the highest score. Your organism will be alive as long as there is one living cell in the playfield. This sounds easy enough, but your organism is under constant attack by aggressive bacteria!You have infinite lives. However if you die, the bacteria will temporarily have free play in the organism, so be careful to protect your host. If your score is high enough, you will get a bonus life which means that one of your host's cells will divide. Unfortunately this new cell is moving and will move to far away from the organism and die.Therefor your ship has been equipped with docking features so, you can permanently install these new cells in the organism.
There are 2 types of bacteria: Hunter/Killers and Bodysnatchers.
Bodysnatcher profile:
This red bacterium lives for one and one thing only - To snatch then cells of your organism! Strong points: Can steal cells, has an defensive laser. Weaknesses: Slow, and can be rammed to quickly finish them off.
Hunter/Killer profile:
This green bacterium is very evil. It will come for your ship, and once it has destroyed it, it will transform into a Bodysnatcher to steal cells while the immune system (you) is down. Strong points: Fast, can ram you to death, attack laser. Weaknesses: Can't steal cells.