Before playing each round, you can select the type of cards you want to play with. Regardless of the cards you choose, gameplay is the same, so all you have to do is match the cards based on their designs. Take a look at the board, then tap the cards you want to flip over and try to pair them up.
Every time you find a pair, the cards are left face-up. Keep going until all the cards are matched. Keep in mind that this game has an international ranking system, so you can see how you stack up against other players from all over the world. As you play, this game only gets more difficult, forcing you to rely more and more on your memory to find pairs as quickly as possible.
Ojo rápido has simple gameplay that's nevertheless lots of fun. Stay focused until you find all the pairs, flipping cards as quickly as you can until you clear all of them from the board and beat the level.