don't know if this is intentional or something but when i complete the puzzle in the supply room, i don't get the threesome scene. Additionally, i've tried to unlock the chair scene with the alfredo mask but after the genarator turns off, i still don't get it upon seemingly interacting with the chair.
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If you're referring to the Marie puzzle, you don't get a scene from that one, just $300, the puzzle you need to solve to get the scene is the one in the main room, aka the one that connects to the bathrooms, Fexa's area and the halls. However I would like to note that it sounds like you have a Fredina skin equipped, if that's the case you'll need to change it to a different skin since those scenes are not available if you have a Fredina skin equipped. Hope this helps.
To get the threesome scene, its in the main area of the club, and its in the center wall of where the two hallways are, and theres your puzzle to complete to get the scene. (I don't know how to help you on the chair scene because it not working has never happened to me before or anyone else I think.)