Right, I was able to use one of them for the third step. I've tried to use all of the mushrooms and the coin on Ziggy, the owner, and the grate on the wall but nothing happens (by "use" I'm picking the item up and then quacking at them), maybe there's a certain order? I don't think you need to make the hint clearer, I'm just not sure how to proceed (the heart meter is 85% btw). Maybe a walkthrough can help if you don't want to spoil the answer
Viewing post in Whomesome duck game in need of feedback
Making sure this isn't a bug: On the third level, things are a little strange. (Spoiler) happens after the squirrel puzzle. When I leave the room and come back, an instrument suddenly appears and the (Spoiler) event resets, never happening again, even after redoing the squirrel puzzle. Does the instrument prevent the (Spoiler) event from occurring?