You have to be careful in 3 modes.
* Classical Mode: Tap 30 black tiles and never step the while tile. You have to finish all tiles as fast as you can.
* Arcade Mode: Tiles slides down to screen. Dont step the white tiles on sliding tiles. Dont miss black lines. This mode is endless until you tap the white line
* Target Mode: You have 30 seconds to tap black tiles. Tap black lines as much as you can do.
Enjoy the dont step the white tiles game