While playing a game, hold L2 + R2 and press Square, Triangle, Circle(2), Start.
At the GT Interactive logo during the opening sequence, press L1 + L2 + R1 + R2.
Enter one of the following codes while the game is paused:
| Code | What It Does |
| Press Down(9), Up | Level select [Note] |
| Press L2, R1, L1, R2, Up, Down, Up, Down, Select(2) | Invincibility |
| Press R1, L2, L1, L2, R1, L1, R1, L2, L1, L2 | Temporary invincibility |
| Press L1, R1, L1, R1, L1, R1, L1, R1, L1, R1 | Invisibility |
| Press [Left, Right, Left, Right, Select] two times | Infinite ammo |
| Press L1, L2, Up, L1, L2, Down, R1, Right, R2, Left | All weapons |
| Press R1, R2, L2, L1, R1, R2, L2, L1, Select(2) | Powered-up weapons |
| Press R1(5), L2(5) | All items |
| Press Up, Right, Up, Left, Down, Up, Right, Left, Right, Down | All keys |
| Press L2, R2, L2, R2, L2, R2, L2, R2, L2, R2 | Double damage |
| Press R1(9), Up | Big head Duke |
| Press R1(9), Down | Small head Duke |
| Press R1(9), Left | Big head opponents |
| Press R1(9), Right | Small head opponents |
| Press Select, Up(9), Select, L1 | View introduction sequence |
| Press Select, Up(9), Select, R2 | View kilt sequence |
| Press Select, Up(9), Select, L2 | View victory sequence |
| Press Select, Up(9), Select, R1 | View credits |
Note: After entering this code, exit the current game. Then select the new "Time To Kill" option at the bottom of the main menu, press Left or Right to select a level, then press X to go to the level.
| Infinite Health | 800D71CA 4E20 |
| Infinite Armor | 800D73CC 4E20 |
| Infinite Medkits | 800D7500 0001 800D7502 6000 |
| Unlimited Air | 800D73CE 2EC0 |
| Infinite Throwing Knives | 800D7460 0001 800D7462 03E7 |
| Infinite Throwing Axes | 800D7464 0001 800D7466 03E7 |
| Have Crossbow | 800D7468 0001 |
| Infinite Arrows | 800D746A 03E7 |
| Have Desert Eagle | 800D746C 0001 |
| Infinite Pistol Ammo | 800D746E 03E7 |
| Have Combat Shotgun | 800D7470 0001 |
| Infinite Shotgun Shells | 800D7472 03E7 |
| Have Buffalo Rifle | 800D7474 0001 |
| Infinite Rifle Ammo | 800D7476 03E7 |
| Have Gatling Gun | 800D7478 0001 |
| Infinite Gatling Gun Ammo | 800D747A 03E7 |
| Have RPG | 800D747C 0001 |
| Infinite RPG Ammo | 800D747E 03E7 |
| Have Flame Thrower | 800D7480 0001 |
| Infinite Flame Fuel | 800D7482 03E7 |
| Have Energy Weapon | 800D7484 0001 |
| Infinite Energy Ammo | 800D7486 03E7 |
| Have Freezer | 800D7488 0001 |
| Infinite Freezer Ammo | 800D748A 03E7 |
| Infinite Pipe Bombs | 800D748C 0001 800D748E 03E7 |
| Infinite Holy Hand Grenades | 800D7490 0001 800D7492 03E7 |
| Infinite Dynamite | 800D7494 0001 800D7496 03E7 |
| Have Jet Pack | 800D74F0 0001 |
| Infinite Jet Pack Energy | 800D74F2 6000 |
| Have Bio Mask | 800D74F4 0001 |
| Infinite Bio Mask Energy | 800D74F6 6000 |
| Have Goggles | 800D74F8 0001 |
| Infinite Goggle Energy | 800D74FA 6000 |
| Have Subway Security Key/Skeleton Key | 800D7504 0001 |
| Have Transport Room ID | 800D7508 0001 |
| Have Red Energy Crystal | 800D7518 0001 |
| Have Blue Energy Crystal | 800D751C 0001 |
| Have Green Energy Crystal | 800D7520 0001 |
| Have Scrap of Paper | 800D7524 0001 |
| Have Old Note | 800D7528 0001 |
| Have Torn Paper | 800D752C 0001 |
| Invisible Duke | 800D7A34 14B4 |
| Double Duke | 800D7A36 14B4 |
| Invincible Duke | 800D7A38 14B4 |
| Super Speed | 800D7A3A 14B4 |
| Big Head Duke | 800C0BF4 2000 |
| Gigantic Head Duke | 800C0BF4 7000 |
| Headless Duke | 800C0BF4 0000 |
| Big Head Enemies/Dancers | 800C0BF6 2000 |
| Gigantic Head Enemies/Dancers | 800C0BF6 7000 |
| Headless Enemies/Dancers | 800C0BF6 0000 |
| Infinite Time (Challenge Stages) | 800D82E0 AC3F |
| Infinite Continues | 800D7410 FFFF |
| Walk Thru Walls | 80095F22 2400 80095F62 2400 80095E2A 2400 80095E66 2400 80041ED6 2400 80041EE2 2400 80053564 8005 80053566 3C02 80053568 371C 8005356A 2442 8005224E 2400 |
| All Keys & All Levels | 800D7504 0001 800D7508 0001 800D750C 0001 800D7510 0001 800D7514 0001 800D7518 0001 800D751C 0001 800D7520 0001 800D7524 0001 800D7528 0001 800D752C 0001 |
| Infinite Ammo & Items | 800C3CC4 0001 |
| Level Select Enabled (Main Screen) | 800BDEA6 0001 |
| Level Modifier | 800BE570 00?? |
| Super Weapons (Replaces Weapons) | |
| Super Eagle (Uses Desert Eagle Ammo) | 800D746C 0009 |
| Super Shotgun (Uses Combat Shotgun Ammo) | 800D7470 0009 |
| Laser Gatlin Gun | 800D7478 0009 |
| Infinite Laser Gatlin Gun Ammo | 800D74CE 03E7 |
| Incendiary RPG | 800D747C 0009 |
| Infinite Incendiary RPG Ammo | 800D74D2 03E7 |
| HiTemp Flame Thrower | 800D7480 0009 |
| Infinite HiTemp Flame Thrower Fuel | 800D74CA 03E7 |
| Super Zapper (Uses Energy Weapon Ammo) | 800D7484 0009 |
| Quantity Digits to Accompany Level Modifier Code | |
| 00 - Time To Kill 01 - Miner 69er 02 - Duke Hill 03 - Gold and Guns 04 - XXX(1) (Incomplete Level) 05 - Obey Or Die 06 - Family Jewels 07 - Resistance Is Feudal 08 - Holy Terror 09 - Pig Factory 0A - Hog Heaven 0B - Let The Games Begin 0C - Blood Baths 0D - XXX(2) (Incomplete Level) 0E - Animation Test Level 0F - Mesa 10 - Castle 11 - Dungeon 12 - Coliseum 13 - Warehouse 14 - Factory 15 - Challenge Stage 1 16 - Challenge Stage 2 17 - Challenge Stage 3 18 - Challenge Stage 4 19 - Challenge Stage 5 1A - Challenge Stage 6 1B - The Reaper 1C - Wing'ed Death 1D - Moloch The GateKeeper |