Shift 3 features a maze of monochromatic puzzle-laden and trap-filled rooms that would be inescapable were it not for the player's ability to shift, or flip, between positive and negative space. Shifting turns empty space into solid matter, and vice versa. It also reverses gravity. And it really messes with your head.

All of the Shift games employ jumping puzzles, key hunts, and other platforming standbys, but it's the shift ability that really sets them apart. Shift 3 shows quite a bit more polish than Shift 1 and Shift 2, but they're all worth checking out. Shift 3 improves upon the series' previous releases by adding an autosave feature, some new puzzle mechanics, and collectible and bonus items. It also comes with its own level editor. My only gripe is that its simple story isn't nearly as cool as the underlying gameplay, which (as the fan-created bonus levels demonstrate) is clever enough to stand on its own.

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