This game has the simple concept:
Get Mr. Pixel to the open door.
Easy right? Actually, no.
Even though this a short puzzle game, it has you doing out of the box thinking(and some of it is using your iPhone finger gesture commands, like zooming in or shrinking an area of the screen).
It is fun and calls for you to interact with your iPhone for a lot of the puzzles.
Small download, great gameplay, and no need for WiFi.
Enjoy!