Mahjongg tiles are piled up together. You need to remove the mahjonggs pair by pair until they are all gone. You can only pair a mahjongg if it is not blocked from both sides and that it does not have other tiles stacked above it. Pick the mahjonggs strategically because a single mahjongg can block access to a lot of others. There are a total of 3 levels. The faster you finish, the higher your score.