Walk up to a door you wish to pass and turn around so your back is to the
door. Hold down your fire button and tap the joystick in the opposite
direction to the door. Then push the joystick towards the door and release
the fire button. (THIS IS TRICKY)

LEVEL CODES

-- EASY --- NORMAL - DIFFICULT

1 - "BACK" | "PLAY" | "CLOP"
2 - "LOUP" | "TOIT" | "CARA"
3 - "CINE" | "ZAPP" | "CALE"
4 - "GOOD" | "LYNX" | "FONT"
5 - "SPIZ" | "SCSI" | "HASH"
6 - "BIOS" | "GARY" | "FIBO"
7 - "HALL" | "PONT" | "TIPS"