THE GAME IS CALLED SET
This unassuming little box holds one of the best little puzzle games ever. The rules are dead simple and yet mind bogglingly impossible to play, at the very least you’ll need practice. The name of the game is pattern recognition.
All you need to do is find sets of 3 cards (from 9) where the symbols are either all the same or all different (based on shape, color and shading). It’s difficult to explain why this game can get so infuriating.
Sometimes you will the sets to reveal themselves but nothing happens. Sometimes you just glance at the 9 cards and find one. Practice means you get better but it makes your opponent better as well!