Talk:W. D. Gaster/@comment-27507432-20151230160706/@comment-4566760-20151231102705

You got it right -- the thing is, every time you go through the corridor, there is a very small chance the door to Mysteryman will appear. Every time you go through the corridor, not only does it not appear if you try to go through it once more, but the Fun value is reset, so you have to close the game, save your file with the Fun value changed, and go through the corridor again.