Play Trio Rio. 12 cards will be shown, and you have to find all trios within them.
At the start of a game, you will see 12 cards, and the empty placeholders at the bottom indicate how many trios are to be found. Tap on three cards, if you found a new trio, it will be added to the placeholders below, until all of them are filled.
Some updates have already been performed, please send feedback, in particular if you find weaknesses.