Okay, so it's become very clear that I went way too cryptic with Possy's secret challenges. I know my previous quick fixes to help with the solution (teaser images, comments, etc.) won't quite cut it in the long run, so instead we'll just figure out what needs to be done to the game's mechanics to make it easier for the casual player to figure out.

(In most options, it's safe to say I'll better emphasize in the unlock message that Possy is on a hidden path.)

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Option 1 (Bare minimum): I add in some extra dialogue (likely from Meta) that better conveys the importance of failing OCN multiple times to make Possy appear.

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Option 2: Same as option 1, but I also lower the amount of times OCN needs to be failed in order for Possy to appear.

(Probably just to a single fail.)

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Option 3: I remove the need the play OCN outright and just let Possy be accessible from the get-go.

(Would take away any fair chance OCN would have of being tried, but oh well. It'll have it's time to shine regardless.)

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Option 4: Same as option 3, but I also move the hidden path from it's current position to a much more obvious dead end... or as obvious as I can get with the messy layout that is the Halloween Backstage.

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Option 5 (THE NUCLEAR ONE): I give up trying to have fun hiding things and just put Possy right out in the open. No OCN requirement, no hidden path; just a boring, straight line to a very difficult set of fights.

If this option does win out, it will also heavily affect how I handle secrets (or lack thereof) in future updates.