i might remove the impossible question and the first-person stage, and replace it with something that makes more sense and is more user-friendly
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the question itself is fine! In fact it is fun. It's mostly in the answers where you could change it. As it's mathematically undefined, one option is that any door could be correct. Or, you could add something like a "?" door. It does depend on where you'd like to take the theme. You could go for more wacky questions that either don't make sense or are too difficult, and play instead with comical answers. Like, "what's Σ e(n-1)^2 + 3?", and the answers are just jokes. That could be another fun take of this!