Welcome to this new challenging and very addictive online flash game Underwater Mahjong! This one will surely make your brain work and think. Rules are very simple: just match pairs of identical tiles in order to delete them of the the board and reveal the tiles under or next to them. The challenge is over when you don't have any identical tiles anymore or you removed all tiles from the playboard. You can always click on the shake button to shake the board a little bit if you get stuck. Make sure you pass the level before time runs out. Have fun play for free.