My Mobile Pack Choose yours…

:Shift: began life as a Flash game on the Web. The $1 port to the iPhone by developer Armor Games is excellent, and I find that the new touch-screen controls make the game more satisfying to play than ever.

The first few levels of the platformer explain your predicament: You’re trapped in an odd building, an unhappy subject in a cruel experiment. On each level, you need to figure out the path to escape. You can move left or right (by pressing on the appropriate side of the screen), or jump (either by tapping both buttons simultaneously or tapping in the middle of the screen).

Oh, and there’s one devilishly clever twist: In this monochrome game, black is white and white is black—sometimes. When you need to—and you’ll frequently need to—you can “shift” the game, which flips the playing field and inverts the colors. Now empty space becomes walls, and vice-versa. It’s unique, ingenious, and superbly fun.