To play, all you need is your mind and your finger. Tap to switch between 0 and 1 on each empty cell to complete the grid and solve the puzzle. • 3 levels of difficulty, • 5 different grid sizes (4x4 to 8x8 on iPhone, 6x6 to 12x12 on iPad), • Unique grids, purchased in packs or unlimited, created randomly for you as you go, • 50 free games to get you started. An original and addictive mental exercise to boost your neurones.