The following are known GameShark Codes for Duke Nukem: Time to Kill on Sony Playstation (PS1).

Note: In order to load or save a game you must put the switch on the GameShark in the down position. Then save or load your game and after complete put the switch on the GameShark in the up position.
• Infinite Health
  800d71ca 4e20
• Infinite Armor
  800d73cc 4e20
• Infinite Throwing Knives
  800d7460 0001
  800d7462 03e7
• Infinite Throwing Axes
  800d7464 0001
  800d7466 03e7
• Crossbow
  800d7468 0001
• Infinite Arrows
  800d746a 03e7
• Desert Eagle
  800d746c 0001
• Infinite Pistol Ammo
  800d746e 03e7
• Combat Shotgun
  800d7470 0001
• Infinite Shotgun Shells
  800d7472 03e7
• Buffalo Rifle
  800d7474 0001
• Infinite Rifle Ammo
  800d7476 03e7
• Gatling Gun
  800d7478 0001
• Infinite Gatling Gun Ammo
  800d747a 03e7
• RPG
  800d747c 0001
• Infinite RPG Ammo
  800d747e 03e7
• Flame Thrower
  800d7480 0001
• Infinite Flame Fuel
  800d7482 03e7
• Energy Weapon
  800d7484 0001
• Infinite Energy Ammo
  800d7486 03e7
• Freezer
  00d74880 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
• Jet Pack
  d00d74f0 0000
  800d74f0 0001
• Infinite Jet Pack Energy
  800d74f2 6000
• Bio Mask
  800d74f4 0001
• Infinite Bio Mask Energy
  800d74f6 6000
• Goggles
  800d74f8 0001
• Infinite Goggle Energy
  800d74fa 6000
• Infinite Medkits
  800d7500 0001
  800d7502 6000
• Super Eagle
  800d746c 0009
• Super Shotgun
  800d7470 0009
• Laser Gatling Gun
  800d7478 0009
• Infinite Laser Gatling Ammo
  800d74ce 03e7
• Incendiary RPG
  800d747c 0009
• Infinite Incendiary Rounds
  800d74d2 03e7
• Hi-Temp Flame Thrower
  800d7480 0009
• Infinite Hi-Temp Fuel
  800d74ca 03e7
• Super Zapper
  800d7484 0009