Can't lose lives in rooms
SZVPTOVK
Can't lose lives in elevator shaft
SZUPLOVK
Start with 1 life
PENPIALA
Start with 6 lives
TENPIALA
Start with 9 lives
PENPIALE
Oxygen used up more slowly in shaft
NYSXAOAN
Oxygen used up more quickly in rooms
AYXXSNNY
Won't take damage from shots and collisions
AAEPZIPA
Infinite bombs in elevator shaft
VTNSEXSX
Infinite bombs in rooms
VVVSXXSX
Infinite detonators in shafts
VVOSSXSX
Infinite detonators in rooms
VTESNUSX
Infinite keys in shafts
VTEZIKSX
Infinite keys in rooms
VVOXTOSX
Start on level 5
OZEPOISE
IAEPXSVI
Start on level 10
OZEPOISE
ZAEPXSVS
Start on level 15
OZEPOISE
YAEPXSVS
Start on level 20
OZEPOISE
GPEPXSVI