Amazon Free App of the Day:
Color Switch is a brain bending, tile-based puzzle game. Tapping a tile switches that tile and any adjacent tiles from light to dark or vice versa. Keep switching until all the tiles are dark and you win! Simple rules, crazy hard game.
Change the size of the board to increase difficulty, anywhere from 3×3 to 30×30 if your device is large enough! Stats are tracked so you can pay attention to your progress and you can choose from six vivid colors.