General in (Mario) The Music Box Community

Share your creativity with others!
Surprised how community still going, as the owner seems to be no longer active. Rising community from nothing is really impressive.
Although MTMB 10th anniversary is coming, but I have not been paying much attention to MTMB.
So Im having trouble with the puzzle where you mirror the rooms. I did the puzzle and got the click so I know I did it right. But I dont know what to do now. I looked everything up online but nothing is explaining what I need to do. Can anyone help?
Mario (this mod/fan-game) now has a HFW page, like MIPs!