Here is a guide on how to solve all levels in Ruka. enjoy the game.
Ruka All Levels Guide
Level 9 – Party Room
Level 10 – Study Room
In this challenge you need to be fast. There’s no right way to go, but you need to escape the fog that suddenly appears in the room. Pay attention when the screen blinks, this is where the fog will appear. The ultimate goal is to finish right in the middle of the room. The red line was the path I used.