After the countdown, type "GERRINTAETHUM" to activate these keys:



T = more time

N = next section

U = Los Angeles

B = restart current section

G = end game

1-9 = section select



In pause mode, press F3 and push joystick up for 10,000 points.

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Source: Amiga Future GTT

Level codes (enter on high score screen before game start):
2: WARDEN
3: DIAMOND
4: MAGGOT
5: KNUCKLES
6: MOUSEMAT
7: PRANG
8: ESSEX

Freezer: 255 lives at $34FBD (replace first 2 characters with FF)