It also eases you into each round by allowing you to play its mini-games, puzzles, and other game modes in between each round. The game rolls out more defensive characters as the game progresses to make up for the increase in difficulty. The basic gameplay can appeal to both beginners and experienced gamers, but even seasoned defenders will find some levels difficult to beat. The objective of each battle is to raise a crop of warrior plants that will block zombies from entering your home. It is a free game where you take on the role of a homeowner in the middle of zombie warfare. Plants vs Zombies is a tower defense game developed by PopCap Games, Inc.