Play the Set Game. 12 cards will be shown, and you have to find all sets within them.
At the start of a game, you will see 12 cards, and the empty placeholders at the bottom indicate how many sets are to be found. Tap on three cards, if you found a new set, it will be added to the placeholders below, until all of them are filled.
This is the first version, which is kind of rudimentary for now.