the iPhone and iPod Touch. But it really sinks its teeth into our collective gaming brains on the iPad. The spacious screen and multi-touch controls really feel like the very best way to play "Plants vs. Zombies." In addition to the gorgeous HD graphics, the iPad version also offers the exclusive "Buttered Popcorn" mini-game and it includes Survival Mode (which you won't find on the iPhone version though you will find it on the PC/Mac version).  Be prepared...this game will eat you alive. Angry Birds HD - $4.99 Chillingo/Rovio "Angry Birds" is a study in slingshot physics -- that is, you're tasked with using said slingshot to fling a flock of vengeful avian at the pigs who have wronged them, trying to knock the squealers down from their various fortifications. This super cute, super polished game of demolition has received a lovely high-def update for the iPad. The twisted yet adorable graphics have been prettied up and the game has the room it needs to breathe on the big screen. That said, if you already own the iPhone/iPod Touch version of the game, you may not feel the need to buy the iPad version since nothing but the graphics have been updated. However, if you've never purchased this game before -- this one is a must buy and the iPad version is worth all 499 pennies. "Zen Bound" was a deliciously original puzzle game when it arrived on the iPhone, winning all sorts of accolades for being a truly unique