Unlock Characters in Story Mode: Beat the levels on Medium difficulty to unlock the corresponding characters:

2280 Return to Planet X: Ozor Mox
2019 NeoTokyo: Sadako
1853 Wild West: The Colonel
1972 Atom Smasher: Khallos
1920 Aztec Ruins: Stone Golem

Arcade Adios Amigos level rewards:  Successfully complete the level with a "Gold" rank to unlock Hector Babasco and Lean Molly as playable characters in arcade mode.

Big Tony - Beat the Mafia Mission on normal

Challenge Pane In The Neck level rewards:   Successfully complete the challenge with a "Silver" rank to unlock the Rotating Heads cheat.

Ending bonuses:  Successfully complete the game under the easy difficulty setting to unlock the Cardboard Characters cheat and Streets level in arcade mode.

Hidden mini-games - When using the Temporal Link, press Triangle while using the link to open a set of mini-games, such as Snake.

Faster reloads - Some guns have slower reload times than others. Instead of pressing Reload, press Next Weapon quickly followed by Previous Weapon (or vice versa). When you switch to a new weapon and go back to it, the weapon will automatically be reloaded.

Unlock Cardboard Characters - Beat the game on Easy difficulty.

Unlock Characters in Arcade Mode - Earn a Gold medal in "Adios Amigos" (Arcade Mode) to unlock
Hector Babasco and Lean Molly.

Unlock Rotating Heads Cheat - Beat "Pane in the Neck" in Silver (Challenge Mode).

Unlock Streets Arcade Level - Beat the game on Easy difficulty.
Sent in by Lewis Madison

Multiplayer Maps:

Chasm - Clear Arcade League, Honorary League, Outnumbered but Never Outpunned, Can't Handle This with a Bronze Madal or Higher.

Chinese - Clear Arcade League, Honorary Leauge, Elimination Series, Starship Whoopers with a Bronze Medal or higher.

Circus - Clear Challenge, Monkeying Around, Dam Bursters with a Bronze Medal or higher

Compund - Clear Spaceship: 2401 on the Normal difficulty setting.

Hangar - Clear Arcade League, Amateur League, Beginner's Series, Top Shot with a Bronze Medal or higher.

Nightclub - Clear Arcade League, Amateur League, Too Hot to Handle, Disco Inferno with a Broze Medal or higher.

Robot Factory - Clear Arcade League, Amateur League, It's a Blast, Demolition Derby with a Bronze Medal or higher

Scrapyard - Clear Arcade League, Amateur League - Mode Madness, Scrap Medal with a Bronze Medal or higher.

Streets - Clear Spaceship: 2401 on the Easy difficulty setting.

Ufopia - Clear Arcade League, Honorary League, Maximus, Cold Corpse Caper with a Bronze Medal or higher.
Sent in by Condor19452

Destroying the Bio-Hazard case:- When you restore the power in the building, go down to the "Digging Site". When you get there, you will see a case with something in it. Make sure you have plenty of Timed Mines. Walk towards it and throw four or five Timed Mines at it then run away. When it blows up, the woman on the speaker will start talking. People with very good guns (Flame Thrower, Shotgun, Machine Guns, etc.) will appear. You will also have a new objective to not let any mutants survive.

Faster reloads:-  Some guns have slower reload times than others. Instead of pressing Reload, press Next Weapon quickly followed by Previous Weapon (or vice versa). When you switch to a new weapon and go back to it, the weapon will automatically be reloaded.

2019 NeoTokyo level rewards - Successfully complete the level in story mode under the medium difficulty setting to unlock Sadako as a playable character in arcade mode.

Arcade Adios Amigos level rewards - Successfully complete the level with a \"Gold\" rank to unlock Hector Babasco and Lean Molly as playable characters in arcade mode.

Challenge Pane In The Neck level rewards - Successfully complete the challenge with a \"Silver\" rank to unlock the Rotating Heads cheat.

Ending bonuses - Successfully complete the game under the easy difficulty setting to unlock the Cardboard Characters cheat and Streets level in arcade mode.

2280 Return to Planet X level rewards - Successfully complete the level in story mode under the medium difficulty setting to unlock Ozor Mox as a playable character in arcade mode.

1853 Wild West level rewards - Successfully complete the level in story mode under the medium difficulty setting to unlock The Colonel as a playable character in arcade mode.

1920 Aztec Ruins level rewards - Successfully complete the level in story mode under the medium difficulty setting to unlock Stone Golem as a playable character in arcade mode.

1972 Atom Smasher level rewards - Successfully complete the level in story mode under the medium difficulty setting to unlock Khallos as a playable character in arcade mode.
Sent in by Marcus Landers, Tate Goodman, Neville King, Dwight Harrison

Ending bonuses - Successfully complete the game in story mode under the easy difficulty setting to unlock the Cardboard Characters cheat and the Streets multi-player level in arcade mode.

Successfully complete the game in story mode under the normal difficulty setting to unlock Big Heads and All Characters Cloaked cheats and the Compound multi-player level in arcade mode.

Successfully complete the game in story mode under the hard difficulty setting to unlock the Unlimited Ammo cheat and the Site multi-player level in arcade mode.

Successfully complete all challenges with at least a Bronze rank to unlock the Paintball cheat.

Ending bonuses - Successfully complete story mode on the easy difficulty setting to unlock the Cardboard Characters cheat and the Streets multi-player level in arcade mode. Successfully complete story mode on the normal difficulty setting to unlock Big Heads and All Characters Cloaked cheats and the Compound multi-player level in arcade mode. Successfully complete story mode on the hard difficulty setting to unlock the Infinite Ammo cheat and the Site multi-player level in arcade mode.
Successfully complete all challenges with at least a Bronze rank to unlock the Paintball cheat.

Faster reloads - Some guns have slower reload times than others. Instead of pressing Reload, press Next Weapon quickly followed by Previous Weapon (or vice versa). When you switch to a new weapon and go back to it, the weapon will automatically be reloaded.

Anaconda mini-game in 1990 Oblask Dam Siberia level - Play the level on the normal difficulty setting in story mode. Once you get across to the other side of the dam and go into the other building with all the shelves, look to something that resembles a Nintendo 64 game cartridge on the first shelf. Walk over and pick it up. It will be in your inventory as "Anaconda". Highlight it and press A to play the game.

Astro Lander mini-game in 2019 NeoTokyo level - Play the level on the normal difficulty setting in story mode. After following the hacker to her secret hideout, use her password to enter the TimeSplitter research area. Once inside, go into the room at the end of the hall. Inside is a laptop and a group of lockers. Two of the lockers will open. Inside one is a sub machine gun. Inside the other is the arcade game Astro Lander. It is on the floor of the locker and resembles a Nintendo 64 game cartridge.
Select "Astro Lander" from inside your inventory. A small menu will appear with Astro Lander and two other areas. After playing it or turning off your Gamecube, select your temporary uplink (in story mode) and press A to play Astro Lander or any other game you may have found.
Sent in by Marcus Landers, Tate Goodman, Neville King, Dwight Harrison

Arcade League (Amateur) bonuses
Beginners Series

Adios Amigos!: Hector Babosal, Lean Molly (Gold)
Casualty: Dr. Peabody, Crypt Zombie (Gold)
Top Shot: Hangar Level, Sgt. Shock, Elimination mode (Gold)
Mode Madness

Chastity Chased: Regeneration mode (Gold)
Shrinking from the Cold: Private Sand, Sgt. Slate, Shrink mode (Gold)
Scrap Metal: Scrapyard, Chassisbot (Gold)
It's A Blast

Night Shift: Sentry bot, Leech mode (Gold)
Spoils of War: Meezor Mox, Thief mode (Gold)
Demolition Derby: Male Trooper, Female Trooper, Robot Factory Level, Vampire Mode (Gold)
Too Hot To Handle

Monkey Immolation: Crispin, Flame tag (Gold)
Disco Inferno: Louie Big Nose, Lt. Wild (Gold)
Burns Department: Undead Priest, Nightclub, Virus mode (Gold)
Team Series A

Club Soda: Slick Tommy, Jimmy Needles (Gold)
Station Stand: Lt. Shade, Zones mode (Gold)
Men in Gray: Accountant, Kawer, Assault mode (Gold)

Arcade League (Honorary) bonuses
Maximus

Cold Corpse Caper: Cyber Fairy, Gargoyle (Gold)
Killer Queen: Leo Krupps (Gold)
R109 Beta: Ufopia, Gladiator mode-Bronze
Elimination Series

Baking For The Taking: Chinese Chef, Gingerbread Man (Platinum)
Brace Yourself: Braces, Trooper Brown (Gold)
Starship Whoopers: Chinese, Monkey Assistant, Trooper Black (Gold)
Burns 'n Bangs

Chinese Burns: Calamari, Chef Hat (Platinum)
Snow Business: Snowman, Trooper Grey (Gold)
Rocket Man: Venus Star, Capt. Sand, Duckman Drake (Gold)
Outnumbered, But Never Outpunned!

Someone Has Got To Play...: Capt. Night (Gold)
Time to Split: Barby Gimp, Scourge Splitter (Gold)
Can't Handle This: Chasm, Hatchet Sal, Handyman (Gold)
Team Series B

Hack A Hacker: Krayola, Milkbaby (Gold)
Rice Cracker Rush: Riot Officer, The Master (Gold)
Superfly Lady: Capt. Pain (Gold)

Arcade League (Elite) bonuses
One Shot Thrills

Babes in the Woods: Jo-Beth Casey (Gold)
Double Bill: Beetleman, The Impersonator (Gold)
Nikki Jinki Bricky: Nikki, Jinki (Gold)
Duel Meaning

If I'm Ugly-You Smell!: Mikey Twoguns, Jared Slim (Platinum)
Golem Guru: Kypriss, Fat Characters (Platinum)
Golden Thighs: High Priest, Aztec Warrior (Platinum)
Frantic Series

Hangar's Hat's Off!: Henchman, Dark Henchman (Gold)
Can't Please Everyone...: Maiden, Changeling (Gold)
Big Top Blowout: Mr. Giggles (Silver), Stumpy (Gold)
Team Series C

Bags Of Fun: Ringmistress, Big Hands, Slow Motion Deaths (Gold)
They're Not Pets!: Baby Drone, Bear (Gold)
Nice Threads: Unknown
Sincerest Form Of Flattery

Aztec The Dino Hunter: Dinosaur (Gold)
Half Death: Drone Splitter (Gold)
Dead Fraction: Jebediah Crump (Silver)

Challenge bonuses
Glass Smash

Pane In The Neck: Rotating Heads (Gold)
Bricking It: Brick Weapon (Gold)
Stain Removal: Nothing (Gold)
Behead The Undead

Fight Off The Living Dead: Sewer Zombie (Gold)
Sergio's Last Stand: Unknown
Day Of The Dammed: Feeder Zombie (Silver/Gold)
Infiltration

Silent, But Deadly: Viking Hat (Gold)
Trouble At The Docks: Pirate Hat (Gold)
Escape From NeoTokyo: Big Ears hat (Gold)
Banana Chomp

Gone Bananas: Private Coal (Gold)
Monkey Business: Unknown
Playing With Fire: Wood Golem (Silver)
Cut-Out Shoot-Out

Take 'em Down: Ample Sally (Gold)
Fall Out: Marco the Snitch (Gold)
Pick Yer Piece: Sgt. Rock- Gold
Timesplitters "Story" Classic

Badass Buspass Impasse: Badass Cyborg (Gold)
But Where Did The Batteries Go?: R One-Oh-Seven (Platinum)
Hit me Baby One Morgue Time: Cropolite (Gold)
Monkeying Around

Simian Shooter: Insect Mutant (Silver)
Monkey Mayhem: Lola Varuska, Mischief (Platinum)
Dam Bursters: Robofish, Circus level (Gold)

Timed mines - In a level where you get timed mines (preferably Siberia, since it has zombies), you can throw a mine onto an enemy and it will make them explode. The effect is better with a zombie, because if you hit them with two (one on the head and one on the chest), it will blow them apart.

Destroying the Bio-Hazard case - When you restore the power in the building, go down to the "Digging Site". When you get there, you will see a case with something in it. Make sure you have plenty of Timed Mines. Walk towards it and throw four or five Timed Mines at it then run away. When it blows up, the woman on the speaker will start talking. People with very good guns (Flame Thrower, Shotgun, Machine Guns, etc.) will appear. You will also have a new objective to not let any mutants survive.
Sent in by Marcus Landers, Tate Goodman, Neville King, Dwight Harrison

Destroying camera - Shoot the screen of the camera. This causes it to blow out, conserving your ammunition. For turret cameras, shoot the tip of the barrel since there is no screen.

Fire extinguisher - When you are on fire and have a fire extinguisher, point it down and spray while running. You will have extinguished your own fire.

Kill Zombies faster: - When a zombie comes after you, shoot it in the head.

1853 Wild West:

Defeating the Colonel - Save the black powder not needed to open the jail. When it is time to defeat the Colonel, pour a trail of black powder down the train tracks in the tunnel leading to his lair. Start at the lamp near the mining cart and go down the tracks to where the Colonel speaks to you. Once his health meter appears, retreat. By shooting the lamp, it will fall and explode, setting fire to the powder. The burning powder will race down the tunnel and set fire to the Colonel, along with all the men with him who are chasing you. If you keep running from the Colonel, the fire will eventually finish him.

1990 Oblask Dam Siberia:

Anaconda mini-game - Once you get across to the other side of the dam and go into the other building with all the shelves, look to something that resembles a Nintendo 64 game cartridge on the first shelf. Walk over and pick it up. It will be in your inventory as "Anaconda". Highlight it and press X to play the game. Note: This was done under the normal difficulty setting.

2019 NeoTokyo:

Astro Lander mini-game - Play the level under the normal difficulty setting in story mode. After following the hacker to her secret hideout, use her password to enter the TimeSplitter research area. Once inside, go into the room at the end of the hall. Inside is a laptop and a group of lockers. Two of the lockers will open. Inside one is a sub machine gun. Inside the other is the arcade game Astro Lander. It is on the floor of the locker and resembles a Nintendo 64 game cartridge. Select "Astro Lander" from inside your inventory. A small menu will appear with Astro Lander and two other areas. After playing it or turning off your Xbox, select your temporary uplink (in story mode) and press X to play Astro Lander or any other game you may have found.

2315 Robot Factory:

Racer mini-game - Play the level under the hard difficulty setting. Under one of the ramps is the final mini-game cartridge.

Elite League: Golem Guru:

Easy win - In this level is an area that looks like an unfinished office building with stairs that lead to another level. Go up the stairs and find the metal beams. This is where you will find the Homing Launcher. Get a direct hit on the Golem twice with the secondary function and it should kill him.

Capture The Bag - If you and your team are surrounded in your base and have nowhere to go (if they have defenses positions set up), use the "backwards man" technique. Run backwards and do not shoot at the enemies that run past, unless you want to be brave get to their base. Still running backwards, grab the bag and have another teammate halfway to your point take your fire.
Sent in by Marcus Landers, Tate Goodman, Neville King, Dwight Harrison

Action Replay Codes

(M)
TAZM-GBXM-FP9NM
0DV2-CYEC-NJK16
7E1K-XMPQ-QV22K
36RT-05AQ-1DQBR
2NVA-4PHW-Y1ZMN
P080-HCQF-5U52A

60 HZ
FDKM-3UTY-E2T4H
GXWK-CYAK-DD0E2

Y-Fix
VXD7-1XWP-Q0TNT
PNUX-70RQ-BH8JH
4770-56P3-KX4JA
DGTX-70VJ-AVGDM
V6TP-UC17-2C86N

Infinite Health
ZKE5-36MH-UQH50
JC64-BEZW-QQRN3
QU7Z-4PMG-9NKVM

Unlock Everything
DMD1-F6M2-1J8J3
XYRF-A165-WGCAK

Infinite Armour
WDCG-7TXP-541QV
QQRN-ZCDK-T9DWZ
HNUU-CGW8-GVPR3
E4NU-BZF9-H1D69
5E5Y-1CGU-TQGDN
TRTJ-UEA1-WRZNX
ZZF1-Z94C-5XDPU
8ZVA-ZCKT-8VE4H
W408-63RA-3B5Q0

Ammo Codes
4KYT-XV6E-7P0GE

Infinite Ammo
EPUF-FNGU-MF8UH
HYUK-8AT4-6NVNT

Ammo Increases
7KAC-GRQ7-3HFWU
UEZF-9QJD-4BG6Z
WJAT-RUVM-WKU4P

Size Modifier
D838-ZNXN-NKAND

Fat Characters
T06H-HA9R-HFP56
FX3Q-47MH-Z3TEZ
RZRB-GCAQ-NU6TR

Skinny Characters
AHD9-8BRC-7FF7T
FX3Q-47MH-Z3TEZ
AN9R-M1QQ-95Z5N

Paintball Mode
This code is saveable.
9E7Z-V1YA-6DCQT
F6JC-W5XM-2GUGE

Arcade And Challenge Mode Codes
P5JW-UQTK-VZH3Q

Freeze Timer
Press L3 + Up to activate this code. Press L3 + Down to deactivate.
NXM1-TUK1-UCZKG
6Y17-NQJ5-67BU3
XVKY-98R4-BHY9F
KGZJ-7C47-DHUTN
87ZW-6GBU-DKVYN

Freeze Animations And Timers
Press R3 + Up to activate this code. Press R3 + Down to deactivate.
BNVE-3VJT-Z89BZ
GUDA-V0GQ-79JU6
FH21-6K72-PVHYM
ZW5U-XT1N-Z0634
482R-66EN-7KXKF

Glass Smash Challenges
K5HA-H0W6-0PZ1W
JB9E-91K0-74840

Max Glass Broken
A772-QMB4-H2MAX
EEXW-U2K8-CJF5P

Instant Win
3MEJ-0CNA-6HQQA
6B8F-W5J3-AKUZM

Behead The Undead Challenges
YW2V-CP47-H9TVF
JB9E-91K0-74840

Infinite 3 Seconds Countdown
P44U-TT1Q-XAU3J
B2UZ-2CZH-180RR

Scoring Codes
1BJC-PVMV-WZ7JH
8UQH-1851-EZQPC

Quick Scoring
55GC-PJCM-MD8M5
M9NN-7TD0-RQN3J

Ultra Quick Scoring
3ZU8-QXZ5-AZAPM
VR08-WX2X-JDX0C

Loads Of Stealth Points
For the 'Infiltration' challenges only.
ZJJR-4YFR-H14V9
N2M0-WP1F-ZCNNH

Instant Win
For the 'Banana Chomp' challenges only.
6D5E-AFYY-HZ3G0
JD0D-MCKA-U0R2P

Loads of Points
For the 'Cut-out Shoot-out' challenges only.
DX62-4QZ7-4P5NR
5P9W-8WEP-KMM5Z
U2HG-Z13D-7961M
MCWB-NB44-UE83Z

Loads of Points
For 'Monkeying Around' challenges only.
RVQU-JMQ5-58YAX
H6V9-9PN2-X71XT

Arcade Mode Codes
DPBZ-4G8P-8WXHQ

Health Codes
M8Y4-DCPQ-7R7QH
8UQH-1851-EZQPC

Infinite Health
E8BJ-VF2B-MZY9Q
3MCB-JR7U-FBWER
6G11-0DKZ-9PDNK
44NB-W2VE-78C23
A5YP-23RA-D8K5Z
BMX6-Q0H4-9117E
NMT9-EMFU-QXRG1
F2N1-4D3D-TKV44

Infinite Health And 1 Hit Kills
3Y49-6T37-CY1ND
3MCB-JR7U-FBWER
6G11-0DKZ-9PDNK
44NB-W2VE-78C23
86F7-5DG6-3T6WJ
BMX6-Q0H4-9117E
NMT9-EMFU-QXRG1
F2N1-4D3D-TKV44

No Blood Loss
CYJG-QN14-6DNMA
UY7U-HNB0-1P0X7

Bypass Timer Check
Press L1 + R1 + R2 + L2 to activate. Press Select to deactivate.
UV80-14MG-RF6T3
GACC-VJHJ-3DWDA
B7FC-ZA43-7Y2JC
QCY2-UXAN-TUBMM
T87M-Q5K4-HAE2E

Rapid Fire Codes
JV6A-PRW4-14R29

Rapid Fire With Reload
QH5W-FK7X-NYX22
29RF-1GJM-9HJ3T
EP1U-VNWP-CBTCD

Rapid Fire Without Reload
1BAN-T42F-B3U6J
Y0C6-YPZW-VM7XQ
6ERU-B1C6-5YB4R
WVE8-5Y41-Z3JX9
B9C6-KX43-Q3TCF
QH1B-R39D-1UV2Y
4ZX2-M0CU-2GQ24
DF65-960M-Q5Y23
X3BY-P9D9-GJEGC
XZTJ-T6UG-NUDT4
YK18-7BNP-AVKUD
YK80-YQFD-11JU3
29RF-1GJM-9HJ3T
EP1U-VNWP-CBTCD
ZHW7-0GEG-8YUUK