World of Goo

plants vs zombies is a given

HERE

/thread

Hero Academy is one of the best!

Modern Combat 4: Zero Hour, Need for Speed: Most Wanted, Asphalt 7: Heat, Real Racing 2, Cut the Rope, Angry Birds: Star Wars, Fruit Ninja

Super Monsters Ate My Condo is awesomely addictive.

Check pocketgamer.co.uk and slidetoplay.com for their year-end Best of 2012 lists. Also download one of those Free Apps apps (one is linked to on pocketgamer.co.uk) for games that go free temporarily.

All Angry Birds games.

Put the iPhone in a blender is always fun to play.

Tiny Tower :D

Myst

Super Hexagon.