The following are known CWCheat Codes for Gun Showdown on Sony Playstation Portable (PSP).

_S ULES-00484
_G Gun Showdown [EU]
_C0 1 Hit Kill
_L 0x08ABE4CC 0x4F000000
_C0 Dumb AI
_L 0x08AB047C 0x089367C4
_C0 Enemies Frozen in Quickdraw
_L 0x08ABE460 0x30000000
_C0 Infinite Ammo
_L 0x08A02FEC 0x24020000
_C0 Infinite Health
_L 0x08ABE470 0x7F000000
_C0 Infinite Pistol Ammo
_L 0x2124EA24 0x00000005
_L 0x2147E868 0x00000005
_L 0x2148520C 0x00000005
_C0 Infinite Quickdraw
_L 0x08ABE458 0x4F000000
_C0 Unlimited Winchester
_L 0x214823D8 0x00000064
_L 0x21482864 0x00000064
_L 0x21485AD0 0x00000064