Hello! Great game so far, but I'm feeling a bit stuck... I've gotten 3/4 of the brain pieces, and am having a hard time finding the fourth. Currently I have a blue-ish key that I was hoping would be for either the door the player has "never seen before" or the trapdoor both at the beginning. I noticed in the other comments that someone else had two game cartridges, but I've only gotten one, so maybe it has something to do with that also?
ah now I feel dumb I didn't even know that part of the map existed. I ran into what I'm assuming is a bug when I finished the game though, where I could clip through the door in the basement that the main character doesn't remember being there... after a few minutes it went to the end screen but it made the ending a little lackluster. Otherwise I had plenty fun and was thoroughly spooked. Good game!