I have some questions, how'd you get the watermelon and the compass? I don't really understand the point of either of them too lol.
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The compass is an item found in a dead end of the bunker. It tells you where the nearest notebook is (albeit very poorly), which helped me find the final math notebook and a few others, though it can be misleading at times. The watermelon is a very rare item that spawns in only one trash bin for each attempt. It can be used with the knife to lead Marzia wherever you like, as long as the next one is within a certain distance of her.