The first tile 1.1, and 1.2, 1.3, 1.4 obtained from it by 90^o rotations;
the mirror-image 1.5 of the first tile, and 1.6, 1.7, 1.8 obtained from it by 90^o rotations.

       
Tile 2.1 and it's 90^o rotation images 2.2, 2.3, 2.4 2.4.

       
The same principle is used for denoting other tiles, e.g., 3.1 - 3.4.

               
4.1 - 4.8.

               
5.1 - 5.8.

               
6.1 - 6.8.

               
7.1 - 7.8.

       
8.1 - 8.4.

   
9.1 - 9.2.

   
10.1 - 10.2.

     PLAY GAME