Not sure if this will help
BU2 if the Dark Being is teasing the Monster down below. Return and try looking again. It may take several times, but you MUST see the Monster on the top tower walkways. When the Monster is at the top of the tower, and he is walking around, make sure that he walks all the way off the screen to the right. This is essential! When he walks off the scene to the right, immediately BU2, turn L, F through the dark doorway. Quickly toss down the 2 long boards you cut earlier, then toss down the short boards you cut in the carpenters room. Run across the bridge you've just created. IF you are NOT fast enough, the Monster will come and destroy your bridge and you will have to start all over cutting the boards and watching for him out the window! SAVE YOUR GAME when you successfully cross the bridge.