I noticed a difficulty wall when I entered hard mode, and must say good game. The first 9 were nice and the the music was catchy.
Reviews for "Animals Puzzle"
I've beaten the easy mode in less than one minute but the hard mode would take all my life :D but I didn't go through so much because I was in a hurry nice game dude :D
Simple game made elegant. The pictures were very well drawn, music was catchy, hard mode was just the right level - pretty challenging but not impossible. My only suggestion would be to maybe add a reset button to the levels? Apart from that, nice work!