Ummm, so, there's apparently a Live Action movie adaption of this series. I couldn't find an english translated version, but I was able to locateee a Korean sub, and I still understand some of it cuz I've read the manga.

But the last few parts were tweaked a bit, and I'm kind of confused. The "white bear" game, what was that all about? Something about finding a liar? But then it turned out the bear itself was the liar??? And the matrshyka, how did that game work? I was very, very confused with the rules of that one... If anyone could help me out, I'd very much appreciate it! 

(Here's a link to where I watched it too, if anyone else wants to check it out: https://www.youtube.com/watch?v=f7u1xY9xtG0