SNOWWARRIOR'S PROFILE

Hello! I'm not sure if this thread is alive but I need help! I'm stuck on chapter 5. I think I'm supposed to find a key for the house. I've been searching for a while and the only other key I've found is the "Strange Blue Key" which doesn't even fit in the lock. Where can I find it?!

Edit: Nevermind I've found it! I looked through the maze even further and killed the boss that had it.