Despite walking through 5 rooms checking every tile, I couldn't really seem to find any ghosts. I thought I understood where they should be, but maybe I just got unlucky with their spawns?
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Possible. From a technical perspective it's not the ghosts which spawn at specific tiles but the symbols (and corners) that are randomized and dictate, where the ghosts are. So it's possible that those components just don't end up in a way, a ghost is present. Especially in the beginning, only few symbols spawn and therefore it does happen from time to time, that an empty room is reached. Having 5 empty rooms right after each other is very unlikely though.
Whatsoever, thank you for testing my game~