Game rules :
The purpose of this game is to discover as quick as possible all the pairs of pictures randomly scattered over the grid.
Select game level : it is much more difficult as the number of pairs of pictures is great.
At the beginning of the game, all the pictures are flipped with a "?" on their back. Click on the back of a picture to see it, then click on the back of another one. If the pictures are identical, they stay visible, else they are flipped again automatically.