The Playground

The Playground is a mode in Plants VS Zombies: Apocalypse that is unlocked after the fourth level of the roof world, it has four mini modes where there are unlimited levels. If you die, you can go back to the level you were on,

Primal World
A world that takes place in prehistoric times, with prehistoric plants and zombies. Every 30 levels it turns from day to night, then after 20 more levels, it turns back to day.