Here's a brief comparison of features between unregistered and registered versions:
To play without trial limitations, you should acquire a legitimate key from authorized platforms: Plants Vs Zombies Registration Key List
Because PopCap was acquired by EA, their original standalone registration servers are often inactive, which can cause activation errors even with a valid key. "Cheat" Codes (Typing During Gameplay) Here's a brief comparison of features between unregistered
If you own an old CD-ROM of Plants vs. Zombies and need to unlock it, here are your legal and safe options: Plants Vs Zombies Registration Key List
launcher—a small, purple-themed gateway to a world where lawn care was the only thing standing between you and a zombie apocalypse. In the height of the Plants vs. Zombies