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At the cheats menu, type in these codes:
* LLSNMRTN - Invincibility
* JFFSPNGDNBRG - Infinite lives
* MGRLSGTM - All weapons
* RHNSRLL - Unlimited ammo
* TRNTNNQ - All maps
* DGHTTSRS - All keys
* TKMDKK - Show enemies
* PTLFGNDS - Warp to level 1
* QTMBGS - Warp to level 2
* GTMNDSBF - Warp to level 3
* NCPGHM - Warp to level 4
* RSTPDFRLP - Warp to level 5
* NBCD - Warp to level 7
* LFRRSPR - Warp to level 8
* CRCDND - Longhunter warp
* CTNTSCND - Mantis warp
* THSFNDNT - Trex warp
* HSTSMN - Campaigner warp
* HTSDNM - Gallery
* LRNMSNHR - Credits
* MBRNKLSN - Sprit mode
* HFLLTHSH - Tiny enemies
* PRMSHN - Big heads
* BGGNTSS - Disco mode
* KNTSFSKS - Fly mode
* GSRCGKFS - Quack mode
* CRLSFNDNGS - New color
* LLSNMRTN - Invincibility
* JFFSPNGDNBRG - Infinite lives
* MGRLSGTM - All weapons
* RHNSRLL - Unlimited ammo
* TRNTNNQ - All maps
* DGHTTSRS - All keys
* TKMDKK - Show enemies
* PTLFGNDS - Warp to level 1
* QTMBGS - Warp to level 2
* GTMNDSBF - Warp to level 3
* NCPGHM - Warp to level 4
* RSTPDFRLP - Warp to level 5
* NBCD - Warp to level 7
* LFRRSPR - Warp to level 8
* CRCDND - Longhunter warp
* CTNTSCND - Mantis warp
* THSFNDNT - Trex warp
* HSTSMN - Campaigner warp
* HTSDNM - Gallery
* LRNMSNHR - Credits
* MBRNKLSN - Sprit mode
* HFLLTHSH - Tiny enemies
* PRMSHN - Big heads
* BGGNTSS - Disco mode
* KNTSFSKS - Fly mode
* GSRCGKFS - Quack mode
* CRLSFNDNGS - New color