Find a Same Face (Same Picture

it a kind of memory game.
you can see a picture for a second. and find a picture from 4 suggestions.

When you hit the eight points of the total 20, you can open a higher level.

level 1 ~ 9.
level 1 : find a picture at 6 pictures.
level 2: find a picture at 12 pictures.
level 3 : find a picture at 18 pictures.
level 4: find a picture at 36 pictures.
level 5 : find a picture at 54 pictures.
level 6: find a picture at 72 pictures.
level 7 : find a picture at 90 pictures.
level 8: find a picture at 108 pictures.
level 9 : find a picture at 126 pictures.