Enter the following codes at the 'Enter Cheat' menu then go to the 'Cheat' menu to enable them.

Unlock ALL Codes:
TRSSSMGCTHFFGTRKM

Unlock Invincibility:
LLSNMRTN

Unlock Infinite Lives:
JFFSPNGDNBRG

Unlock ALL Weapons:
MGRLSGTM

Unlock Unlimited Ammo:
RHNSRLL

Unlock ALL Maps:
TRNTNNQ

Unlock ALL Keys:
DGHTTSRS

Unlock Level 1 Warp:
PTLFGNDS

Unlock Level 2 Warp:
QTMBGS

Unlock Level 3 Warp:
GTMNDSBF

Unlock Level 4 Warp:
NCPGHM

Unlock Level 5 Warp:
RSTPDFRPL

Unlock Level 7 Warp:
NBCD

Unlock Level 8 Warp:
LFRRSPR

Unlock Longhunter Warp:
CRCDND

Mantis Warp:
CTNTSCND

Trex Warp:
THSFNDNT

Campaigner Warp:
HSTSMN

Spirit Mode
MBRNKLSN

Big heads:
HFLLTHSH

Disco Mode:
BGGNTSS

Fly Mode:
KNTSFSKS

Purdy Colors:
CRLSFNDNGS

Quack Mode:
GSRCGKFS

Show Enemies:
TKMDKK

Enemies don't Attack:
TDHPEACE

Unlock Gallery:
HTSDNM

Show Credits:
LRNMSNHR

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