Switch the cross. Turn every light off.
Tap a cell to toggle it and its four orthogonal neighbors. Turn every light off. Puzzles are generated using legal toggles.
Pause at any time and continue your saved game later. Your game state and personal best stay on your device. Erase them from the in-game privacy screen. No ads, purchases, accounts, Internet permission or analytics SDKs. The interface follows your system language in English or Chinese.
Switch the cross. Turn every light off.