This is the third world of this game. Some levels are going to get harder after you complete each level. Remember, if you defeat all zombies in the final wave, you can get a trophy. Remember, Start level 21-30 and then you will see the instructions how to go to next world and play.
The game will randomly lag every time while you're playing each level for time. Some zombies are annoying like Dolphin Rider Zombies who can pass plants forever, and other zombies are annoying too.
