A reaction/memorize your cards type of game.
Karta Challenge is primarily designed for two (or more) participants, but you can also compete against CPU-Players.
Try to tap the shown card before your opponent does. But beware: The card may not be on the playing field. The fastest player wins.
Besides a quick match, you can also play in finals (up to sixteen players) with random pairings and in a league (three to six players), in which everyone plays against all others.
This is the Lite-Version which contains only one set of cards (and some other, less important features, are missing).