The following are known CWCheat Codes for Hammerin’ Hero on Sony Playstation Portable (PSP).

_S ULUS-10392
_G Hammerin' Hero [US]
_C0 Freeze time
_L 0x201A837C 0x24840000
_C0 Inf def
_L 0x201A4E28 0x00000000
_C0 INF. Lives
_L 0x0030799C 0x00000003
_C0 Infinite Lives
_L 0x0030799C 0x00000063
_C0 Infinite Lives2
_L 0x01362EB0 0x00000063
_C0 Infinite Special 
_L 0x20164838 0x24420000
_C0 Infinite Time
_L 0x0147B23C 0x000000C8
_C0 Max score
_L 0x202f7ec4 0x0098967f