CarrionCrow: Might give that a shot somewhere down the line after I finish the standard playthrough. Still working on that, though.
gunsynd: Do have the stats book in your game?
I haven't played for a good while,but I can tell you that luckily the game reloads nearly instantaneously otherwise I wouldn't be playing it that way.
I'm always looking for a challenge in a game.
Not sure. I'll have to look.
As far as challenges go, I've got more than a few.
The post-game extra levels of Escape Goat, Super Meat Boy, Stealth Bastard Deluxe, Dark Souls 1, Final Fantasy 3, One Finger Death Punch, the high-end speed levels of Cook Serve Delicious, Crimzon Clover and Soldiers - Heroes of World War 2 come to mind off the top of my head as games I either know firsthand or have, haven't played yet, but have read about their difficulty.
Almost forgot. Would definitely add 7th Saga to that offhand list. That's going to be a total nightmare to complete.