Activate the following cheats by entering the corresponding codes in the Cheats Menu under "Options." Enter the entire phrase given below, punctuation included. Capitalization does not matter. Once a cheat is entered you may toggle them from a master list. If the cheat effect isn't made obvious by its title, we give a description of it in parenthesis below. Note: Entering cheats disables saving and unlocking trophies:

CHEAT FUNCTION - CHEAT CODE
Invincibility - HE GIVES STRENGTH TO THE WEAK
Infinite Dead Eye - I DON'T UNDERSTAND IMNFINITY
Infinite Horse Stamina - MAKE HAY WHILE THE SUN SHINES
Infinite Ammo - ABUNDANCE IS EVERYWHERE
Money ($500) - THE ROOT OF ALL EVIL, WE THANK YOU!
Horse - BEASTS AND MAN TOGETHER
Diplomatic Immunity (Marshalls ignore crime) - I WISH I WORKED FOR UNCLE SAM
Decrease Bounty - THEY SELL SOULS CHEAP HERE
Gun Set 1 - IT'S MY CONSTITUTIONAL RIGHT
Gun Set 2 (buffalo rifle, sawed-off shotgun, semi-auto pistol, Schofield revolver, Winchester repeater, and fire bottle x3) - I'M AN AMERICAN. I NEED GUNS
Who? (Turn into a Nobody) - HUMILITY BEFORE THE LORD
Old School (Sepia Filter) - THE OLD WAYS IS THE BEST WAYS
Sharp Dressed Man (Unlock Gentleman's Suit) - DON'T YOU LOOK FINE AND DANDY
Lewis and Clark (Unlock all areas) - YOU GOT YOURSELF A FINE PAIR OF EYES
Jack Attack (Change John into Jack) - OH MY SON, MY BLESSED SON
Man In Uniform (Unlock US Marshal, US Army and Bureau Uniforms) - I LOVE A MAN IN UNIFORM
Good Guy (Get a good reputation) - IT AINT PRIDE. IT'S HONOR
Gang Chic (Unlocks Treasure Hunter Ouftift) - YOU THINK YOU TOUGH, MISTER?
Hic (Permanent "drunk" effect) - I'M DRUNK AS A SKUNK AND TWICE AS SMELLY
Coach (Spawns a coach) - NOW WHO PUT THAT THERE?
Famous (become instantly Famous) - I AM ONE OF THEM FAMOUS FELLAS