Press "Pause" and select the "Options" menu. Scroll down to "Cheats" and press "Y". The keyboard will pop up and you'll be able to enter your code and unlock the cheat you wish to use. Cheats will be ...

It's a disc-based version of the Legends and Killers, Liars and Cheats & Undead Nightmare DLC packs, And it can be played standalone.