Online Mahjong is an online version of a traditional chinese game Mahjong. The main goal of Online Mahjong is to remove all the tiles from the game field. Are you smart enough to finish the game?
use your mouse to remove tiles, a tile must have at least one vertical side unblocked in order to be playable
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.