Red Dead Redemption

Cheat mode:
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Go to the options menu, and select the "Cheats" option. Then, press Y,
and enter one of the following cheat code phrases to activate the
corresponding cheat option. Note: Enabling a code will permanently
prevent the game from being saved and achievements from being earned.

Lewis and Clark
Enter "YOU GOT YOURSELF A FINE PAIR OF EYES" as a code phrase to
unlock all areas.

Invincibility
Enter "HE GIVES STRENGTH TO THE WEAK" as a code phrase.

Infinite Dead Eye
Enter "I DON'T UNDERSTAND IMNFINITY" as a code phrase.

Infinite Ammo
Enter "ABUNDANCE IS EVERYWHERE" as a code phrase.

Gun Set 1
Enter "IT'S MY CONSTITUTIONAL RIGHT" as a code phrase to unlock
some weapons.

Gun Set 2
Enter "I'M AN AMERICAN. I NEED GUNS" as a code phrase to get the
buffalo rifle, sawed-off shotgun, semi-auto pistol, Schofield
revolver, Winchester repeater, and fire bottle x3.

Decrease Bounty
Enter "THEY SELL SOULS CHEAP HERE" as a code phrase.

Diplomatic Immunity
Enter "I WISH I WORKED FOR UNCLE SAM" as a code phrase. You will
now have no bounty/wanted level.

Good Guy
Enter "IT AINT PRIDE. IT'S HONOR" as a code phrase to have a
good reputation.

Famous
Enter "I AM ONE OF THEM FAMOUS FELLAS" as a code phrase to
become famous.

Money
Enter "THE ROOT OF ALL EVIL, WE THANK YOU!" as a code phrase to
get $500.

Coach
Enter "NOW WHO PUT THAT THERE?" as a code phrase to spawn a coach.

Horse
Enter "BEASTS AND MAN TOGETHER" as a code phrase to spawn a horse.

Infinite Horse Stamina
Enter "MAKE HAY WHILE THE SUN SHINES" as a code phrase.

Gang Chic
Enter "YOU THINK YOU TOUGH, MISTER?" as a code phrase to unlock
the Treasure Hunter Outfit.

Man In Uniform
Enter "I LOVE A MAN IN UNIFORM" as a code phrase to unlock the
Bureau Uniform, U.S. Army Uniform, and U.S. Marshal Uniform.

Sharp Dressed Man
Enter "DON'T YOU LOOK FINE AND DANDY" as a code phrase to unlock
the Gentlemen's Suit.

Jack Attack
Enter "OH MY SON, MY BLESSED SON" as a code phrase to change
John into Jack, John's son.

Who?
Enter "HUMILITY BEFORE THE LORD" as a code phrase to become a
nobody.

Hic
Enter "I'M DRUNK AS A SKUNK AND TWICE AS SMELLY" as a code
phrase to become drunk.

Old School
Enter "THE OLD WAYS IS THE BEST WAYS" as a code phrase to enable
the Sepia filter.