Kuku, ISIS puzzle, online games

I am a munfacturer to produce ISIS puzzle for my customers. I was told this puzzle is difficult to solve. You could improve your intelligence in finding key way.

ISIS is the complex one I think. See the picture at the left side. I have a sample from my customer, I take so much time to open it.

It does take me into thought, how to solve the puzzle, interesting and amazing.

And there is another one is called Kuku. It is different from ISIS, and different

key to solve the puzzle. I tried many times, it really need some skills. All in one word: Amazing.