To select levels
Enter on the continue screen:
LDKD- Face the beast
HTDC- In the cage
CLLD- Air ducts
LBKG- Entrance to the underground caverns
XDDJ- Destroy wall
FXLC- Big Rock
KRFK- Flood cavenrs
KLFB- Release friend
DDRX- Disconect power
HRTB- Drop Orb
BRTD- Escape City
TFBB- Outside City
TXHF- Find the tank
CKJL- Eject from tank
LFCK- Final escape