Plants vs. Zombies, bringing it more in line with its non-mobile counterparts. The iPad version sees the bulk of the updates, adding several new game modes, mini-games, achievements and leaderboards. Specifically, it adds the Zen Garden, Vasebreaker Endless and I, Zombie modes, along with the Slot Machine mini-game. An optional mini-game pack including Zombiquarium, Portal Combat and Beghouled Twist can also be unlocked with in-game currency (earned either through gameplay or, you guessed it, in-app purchase).
The iPhone and iPod Touch version, meanwhile, receives only the Vasebreaker mode, additional achievements and leaderboards. The update is available now. Whether or not you have any free time available, well, that's something else entirely.