Ok, this is the complete set of codes for WarHawk.  If you're 
interested, it's worth using a hex-editor to look at the files
on the WarHawk CD. 

Complete Code List for WarHawk (NTSC)
-------------------------------------
SS OSXST = Preview Epilog Text
S OSTXXS = Check Special Upgrades Text
OOO XTXX = Warhawk A-La Mode (Infinate Weapons, Invincible)
TTOTSTTX = Infinate Weapons (Non-Invincible)
SOSSTXTT = Thor Mode (9999 Flash-Bombs)
XOOSXTOT = Kali Mode (Super Swarmers, Ultra-Lockons)
TX OOXTS = Preview Movies
TXTSSSXT = Face to Face with Kreel
TXSTOSXX = Kreel's Door is Open
TXSOTXTS = Above 3rd Force Field
TXTTTXOT = Above 2nd Force Field
TXXSOSOX = Above 1st Force Field
TXTSOXOO = Stormland
TOOTTXST = In with the Gatekeeper
TOOSTOOX = West Gauntlet Boss
TOXTOXTS = East Gauntlet Boss
TOTOTXSS = Gauntlet Level
SSXOTOST = Volcano Boss is Active
STXXXTOS = Volcano Level
XSTOXTSS = Airship Rear Hanger Open
XOTTOOOX = Post Transformation Airship
XTXSSTST = Airship Level
OOOSTTST = Approaching Uma
OSTSTTTS = In Canyon with Crystal
OTXSOOTT = In Canyon with Belle
OSOSXOOT = In Canyon with Amber
OTTXOOSO = Canyon Level
TOXTOOXS = Desert All But Done
TSXTOSOX = Pyramid Has Risen
TSXTXXSS = Desert Level

T = Triangle
S = Square
X = X
O = O
  = Space

- David Griffiths

Complete Code List for WarHawk (PAL)
-------------------------------------
OTO XO=T preview the epilogues
OX= XXOX check the special upgrades (eg all structures, needlessly destructive)
T=T= OOO warhawk a-la-mode
XXO=T=XX infinite weapons
OTTXTOXO thor mode
X=OXX==T kali mode
TO OOX=O preview the movies
=OO=TTOT face-to-face with kreel
=OX=TX=O kreel's door is open
=OOXTTT= above 3rd force field
=OOT=T=X above 2nd force field
=OTOT=OX above 1st force field
=OT=OXXT stormland
=XX=O==O in with the gatekeeper
=XOOT=TX west gauntlet boss
=XT=XOXO east gauntlet boss
=XXO=OTX gauntlet level
OTO==XOT volcano boss is active
O==OOXTO volcano level
XX=XT==X airship rear hangar is open
XO=TXTTX post-transformation airship
XTTXXOO= airship level
==XO=X=O approaching uma
==O=O=TX in the canyon with crystal
=T=T=OO= in the canyon with belle
=TOTOOOT in the canyon with amber
==OXTXOT canyon level
T=X=OXTO desert is all but done
TOXO=OXT pyramid has risen
TOTXO=XT desert level
 
T triangle
O circle
= square
X cross
  space (use right arrow)

- Anthony Baxter