Ninja Mahjong is a free online mahjong game that has a story behind it. There are rival ninjas who have come to your dojo and completely disrespected it by destroying your equipment and training ground. All you have to do is become shrewd and meet their challenge by removing the tiles from the mahjong piles that are arranged in the game. In order to defeat these ninjas, you have to remove 144 tiles from the pile and these have to be free. A free tile is that which has one side free, left or right, and is not partially or fully covered by others. The tiles are removed by clicking on identical pairs of tiles. Other tiles that can be removed together are the flower tiles, four in number, and the geisha tiles, which are also four in number. You can use your magical powers to peek into the future and see what the ninjas have planned for you, and if you are stick you can use the hint button. Using the hint button will reduce your score. Now that you know the story, it is time to play the game; it starts off very well with the doors to the dojo opening, then you get surprised. The game is very complex. The imagery on the tiles is that of the traditional mahjong. So you have to be very keen in order to defeat these ninjas. You will be able to see the number of tiles left on the pile, the time you have taken and the number of points at the bottom of the game. It is also here that you will find the peek and hint buttons. You may also undo a move if you felt that it was an unwise move, but only for one play only. Good luck as you attempt to seek your revenge on these pesky ninjas.