Roof

The Roof is the roof of your house, of course!

Classified as the 'roof' level by the game, it consists of a 5x5 sloped side and a 4x5 straight side.

How it affects the game
Normal plants(Peashooters, Repeaters) will not be able to hit zombies if planted on the sloping side, so you will need to use catapult plants for this stage. You also need to plant flower pots to build plants on the roof(duh).