I can't rate it... solved but I don't know why... This can't happen to me with a @richardfu level. Still trying to understand the level...
Understood now after reading first spoiler with three tips. I think it is really original but too complex. Anyway, thanks once again to create so good levels...
Nice optical illusion. Spoiler This is like one of those TV static pictures you have to look at cross-eyed to see the 3D image.
I have to admit that I was lucky when it came to solving this level !! But it is original, very original ....After I read the spoilers I understood everything....Thanks for sharing and well done @richardfu_