There are 30 cards on the field. Tap cards to flip them. If 2 flipped cards have the same picture, they stay face up and you get 1 point. If the pictures are different, the cards flip back. Reveal all cards to finish the game. Other names for this game are Memorama, Pelmanism, Shinkei-suijaku.
The game can be played alone (single-player mode), but also by 2, 3, 4, 5, or 6 players together on the same device. The app doesn't require wifi or the internet and can be played offline.