At the end of every level, they unlock a new plant and their arsenal of foliage steadily grows. To prevent this, players are given an array flora and fungi offering them both offensive and defensive options – ranging from pea-shooting plants, to immovable rocks to spikes which attack the zombies' feet. If the zombies manage to cross the lawn and enter the house, the player loses. The zombies come in a variety of forms some wear buckets and traffic cones to ward off damage, some sprint across the lawn in American football gear, while some float above the lawn using balloons. The game's basic premise is simple the player is trapped in a house and has to fight off wave after wave of approaching zombies.
