which chest? There is one in the cave that you’ll have to come back for after getting the wall jump ability. The key you need is hidden in a journal. You have to press up when next to a desk in one of the later rooms. I need to put a hint in for that, I want the player to press ‘up’ on anything interesting or suspicious to encourage exploration. But it’s a little obtuse right now, sorry. I’m trying to minimize sprite glitching, but it’s tough on GBC, and the visual weirdness when changing scenes will be fixed for the final release.