A barrage of bugs is attacking your home, and you need to defend it with potted plants! You control your character at the top of the screen where there are six potted plants. These can be dropped on the bugs to destroy them as they make their way up from the sewer at the bottom. Just beneath the potted plants are six windows; you need to make sure you destroy the bugs before they can reach these windows.
The game gets progressively harder as the levels progress, with faster and more challenging bugs appearing on screen. Each type of bug has a different movement pattern, requiring you to think strategically about which plant to drop where. The goal is to protect your home from becoming fully "cracked", by destroying all six layers before they reach the windows.
The game ends when six layers of the building have been eaten.