ThreeXor is a match three game where each card has a quantity, color, shape, and shading and you have to find matches that are all the same or all different for each attribute.
Click three cards to pick up a match. After clicking two cards the third card you need will pop up in the Match Card window to help you learn the game.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.