In Search Of Impossible Tasks Hidden Inside Regular GamesS

Commenter Sir BeefyChu is looking for super difficult challenges lurking in otherwise normal games in today's episode of Speak-Up on Kotaku.

I need suggestions for games with horrific difficulty. Well, not really the game in general. But I've played a few games that have dungeons with 99 floors, but they were optional. Anyone know any games like that? (New and old!) Also, any incredibly insane boss battles? Basically looking for games with that optional, insane difficult task that most gamers dare not even attempt.

About Speak-Up on Kotaku: Our readers have a lot to say, and sometimes what they have to say has nothing to do with the stories we run. That's why we have a forum on Kotaku called Speak-Up. That's the place to post anecdotes, photos, game tips and hints, and anything you want to share with Kotaku at large. Every weekday we'll pull one of the best Speak-Up posts we can find and highlight it here.
[Don't miss the full, gorgeous rendering of Final Fantasy XII's Yiazmat over at Scelatio's DeviantArt Page]