guides in Advanced Education with Viktor Strobovski

https://www.youtube.com/watch?v=XKC1r3XrWLo

How to get the black key

https://www.youtube.com/watch?v=h4SdVTBoFAk

In this video you can see how to get all the achievements.

https://www.youtube.com/watch?v=TROLBVddQnI

Warning: Spoilers! This video shows what's up with those strange buttons in the newest version of the game.