If you only need to play a few hours, the trial version is perfectly safe. How to Enter Your Registration Key
Sites like Eneba or AllKeyShop sell keys for the Origin/EA App version of the Game of the Year Edition . In-Game Cheat Codes (No Key Required) Plants Vs Zombies Registration Key List
: Includes the full version of Plants vs. Zombies along with its sequels. If you only need to play a few