Plants vs. Zombies does tower upgrades differently ... A total of 19 mini-games can be unlocked: Zombotany, Wall-Nut Bowling, Slot Machine, It’s Raining Seeds, Beghouled, Invisi-Ghoul, Seeing ...

Plants vs Zombies Zombotany PopCap seems to have been asking itself the same question, as it just released a huge update for Plants vs. Zombies on iPhone that will take players to the Zen Garden.