i live for "hard" games. Doom 3 nightmare was actually decently hard since you got like a 15 hp limit, anything higher ticks back down to 15. Just sucks you had to beat a different diff first because they didnt change any monster spawn points at all.
I really want to see what happens with Dragon Age: Origins. Got to play with the devs awhile back and it was lookin pretty good, just hope they made it harder than the cheese i played a year ago.
