The Mah-Jongg Key

The game starts with the tiles being piled up on the screen. You can select one with the left mouse button, and you need to select another available tile of the same sort. Tiles can only be paired when there are free on either their left or right side, so if they are stuck between two tiles, they can’t be paired. The red tiles match all other red tiles, and the same goes for the green tiles. There are also quarter moon tiles, and they can be paired with quarter moons that go in a different direction!