Anyone out there know how on earth you get the 100 matroushka dolls????…

Not only the 1ooth doll is missing, the key from treasury is also hidden, where can I get them??? finished the game several times already!!! very annoying

This game is not winnable. Others have gotten the 100th doll but the key was not awarded. This game is a hoax.

Not true. I have gotten the key a couple of different times. I went through the game first on easy ,then medium and then hard. If you keep the same player, you don't lose your upgrades when you play a different difficulty level. I still haven't found out how to use the key but I suspect it has something to do with the tree with the treasure chest chained to it in one sector. If anyone could figure that out, I'd be grateful. The dolls aren't too hard. Some levels have more than one in them.