Select 2 of the same Mahjong tiles to remove them from the game. You can only select stones that have at least one side (left or right) free and that have no other tiles placed on top. The aim of the game is to clear the layout by pairing up all the tiles. You can match any pocket watch tiles with another, this also applies to the clock tiles. You can increase your time by pairing up the tile with a clock on it that is counting down. The faster you play those tiles the more extra time you get. You can also slow down and freeze that clock to help you.