Yeah, those were just in case of mistakes. Since the level is pretty long I didn't want players having to restart cause of one bad mistake
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Okay, that was probably a good idea =). After I unlocked enough to get to the exit, I started exploring the remaining rooms (one was behind a locked door, which seemed suspicious), wondering if there was a secret, but when I finally made a mistake that blocked off a section, I hoped that's all they were for and I made a run for the exit ;).