July 4, 2025 9:17 PM (GMT+2) The antechamber’s doors are all sealed. So far I’ve found the way to unseal two of them.

• South door: Must find a Broken Lever and use it in the Greenhouse.
• East door: Must find a lever in the Great Hall.

I still don’t know how to unseal the west door.

July 16, 2025 1:40 AM (GMT+2) The west door is unsealed using the Secret Garden. I’ve moved this knowledge to Antechamber levers for organizational purposes.

I finally managed to reach the Antechamber! Inside, there was a note (“To continue up, you must go down”) and they key to the basement (see How to enter the basement?).

I’m unsure what will happen if I reach it a second time, but for now since I already managed to access it once, I’ll mark the mystery as semi-solved.

What still remains to be solved is how to open the door with a half-moon shape on it, but that’s almost certainly related to The 46th room mystery rather than this one.

July 24, 2025 1:33 AM (GMT+2) The reward doesn’t change when you reach the Antechamber again, it’s always a Basement Key (I’ve reached it 3 times already). I’ll mark the mystery as fully solved.