Mahjong Key is one of the versions of mahjong puzzle game, in which tiles are stacked onto each other arranging the shape of an old, rusty key. It's one of the simplest mahjong games, as there are a lot of open tiles, and chances of getting locked(no pun intended) are slim.
How to play
Combine two of the same tiles to remove them from the playing field. You can only remove open tiles. An open tile is not covered by another tile and at least one side (left or right) is open.
For more details, check out our guide on how to play Mahjong Solitaire.