For this part I decided I wanted to have the player fight Majora to get the Ice Arrow. Initially my idea was to have a Grotto in one of the holes of the Woodfall Temple upper room. The player would jump down the hole and enter the Grotto taking them to the Majora room. This ended up not working out as there are two general objects of which only one can be loaded at a time. One we call "Field objects" which is used in most cases. The other we call "Dungeon objects" which I'm sure you can guess is used in dungeons as it contains things like switches. The problem for me is that Grottos are part of the Field objects and Woodfall Temple needs Dungeon objects. So I had to scrap that idea and instead changed it to just be a hidden door. This required me to modify some of the collision such that I can trigger a load out to the Majora room by opening the door.