I like the theming of all the rooms, solved 3 so far! (spoilers) currently stalled in engineer room. Have a metal gear, have a fretsaw. haven't found valid use for saw yet. feel like I might need maybe another gear (or something like it) for the machine? otherwise I think it has to do with the two 5x5 grids in other rooms (esp the star chart, which I think is what looktostars might refer to), don't know how those might map to the 3x3 sockets though.