not much really, you get a lot of bonus points and an achievement but that is all as far as i know.
To beat Krauser in Resident evil 4 you need to keep shooting with your magnum.But unsing your knife when he is on his knees is okay too.
play it
beat all the scenarios including decisions decisions, then you've did it
beat the hole game
beat the game on normal
beat the main game
beat the game in 5 hours
You got to be quick on your feet
Beat the game first
The ending is the same no matter what difficulty you cj=hoose, you get the satisfaction of beating the game with everything it can throw at you though.
The way to use the laser pointer in resident evil 4 is by using the classic controller than the nunchuck if this isn't what you mean you have to beat it on professional difficulty
unfortunately extreme battle mode in resident evil 2 isn't possible. But in the new game resident evil operation raccoon city just beat story mode on the hardest difficulty