Invincibility
Go to the code menu and put in LRGARMS.
Skip Level
Go to the code menu and put in QUITER.
More Health
Go to the code menu and put in BUTTERUP.
All Weapons
Go to the code menu and put in STRAPPED.
Get Rag doll
Go to the code menu and put in CLUMSY.
Unlock all combos
Go to the code menu and put in NINJA.
Get Max Ammo
Go to the code menu and put in MRJUAREZ.
Slomotion Button
Go to the code menu and put in SLIZOMIZO.
Bouncy Men
Go to the code menu and put in BOUNZMEN.
Level Warp All
Go to the code menu and put in PASSKEY for a code.
Do not select
Go to the code menu and put in DONOTSEL.
Get Clown Hero
Go to the code menu and put in SCARYCLOWN.
Get SuperJohn Hero
Go to the code menu and put in SUPERJOHN.
Get GI John Hero
Go to the code menu and put in GNRLINFANTRY.
Get Nara Hero
Go to the code menu and put in WEIGHTGAIN.
Get Nikki Hero
Go to the code menu and put in HAIRLOSS.
Get Moseley Hero
Go to the code menu and put in BIGLIPS.
Get Convict Hero
Go to the code menu and put in JAILBREAK.
Get Robot Hero
Go to the code menu and put in MRROBOTO.
Get Zombie Hero
Go to the code menu and put in IAMSODEAD.
Get Lizard Hero
Go to the code menu and put in HISSSS.
Dramatic Finish
Go to the code menu and put in STYLIN.
Clutter The Place Up
Go to the code menu and put in CLUTZ.
Get Max Damage
Go to the code menu and put in SPINACH.
Get Free aim
Go to the code menu and put in FPSSTYLE.
Unlock Concept Art
Go to the code menu and put in SKETCHPAD.
Get Ending Scene
Go to the code menu and put in WIMP.
Get Armor
Go to the code menu and put in STEELUP.
Unlock all movies
Go to the code menu and put in DIRECTOR.
Get Baseball Bat
Go to the code menu and put in SLUGGER.
Unlock Pain Arenas
Go to the code menu and put in MAXIMUMHURT.
Easy kill
In the rooftop battle, if you knock down a man, you can throw him off the building, killing him.
When you are being attacked by someone, press "Crouch" + "Strong Attack" ( [Kick] ). You will spin with your leg out while crouching and knock them down, which will make it easy to pick them up and throw off a surface, stomp on them, pick them up then attack, or just throw them into a wall. Note: This works very well if large crowds are attacking. If they jump when you do this and you miss, either kick them and do it again or try it again immediately (spin with your leg out while crouching). Usually, Precrime with blue armbands will jump.
Enable the "Maximum ammunition" code. Buy the puke grenade and use it to make your enemies unconscious. Then, pick them up and you can throw them around, punch them, and use them as a body guard . Note: You must quickly pick them up, as they stay unconscious for a limited amount of time.
Defeating Nikki Jameson
Note: You must be able to get to the top floor. On the last level, once you are on the top floor, jump onto the space that you can stand on the pit that falls to the bottom. Make sure that you do not fall in. Eventually, Nikki will use the attack where she jumps onto your head and grabs it. When she does this, you will both fall into the pit, but the ending sequence will appear before you die. Note: She may just knock you with normal punches and kicks, but when you get close to falling, just reposition John.
Suspect: Nikki Jameson level: Prevent Nikki attacks
A Wasp Launcher is required for this trick. At the end of the level, where you turn the corner and confront Nikki, partially creep through the door. Do not go all the way or you will trigger the ending scene. Fire the Wasp Launcher so the projectiles will lock on to Nikki and she will run up out of the hallway. She is invincible, but will not attack Barry. Note: If you walk through the hall, you will end the level as normal.
Practice against police
When in the level where there is a revolt with gangsters against the normal cops, after defeating the PC units, side with the gangsters. You will be able to practice fighting moves on the normal police.
