3D Mahjong is a Mahjong kind of game in 3 Dimensions.
Match 2 of the same (not enclosed) blocks to remove them from the game. Rotate your view with the mouse or the arrow keys. Each new level is increasingly difficult.
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.