In Organic wars, two or four players send out their army of bacteria to conquer the territory of the others (it's played on a square grid). At the beginning of each turn, bacteria on each "infected field" (a field with a bacteria on it) which neighbors exactly one other infected field, will spread into another neighboring field. Afterwards, bacteria can move to neighboring fields. Where bacteria of two players meet, the one with more units will win, with both players losing as many units as the loser had. A player who can conquer an enemies home base wins.