Level codes:

Level 2: TWILIGHT   (Night)
Level 3: PEA SOUP   (Fog)
Level 4: THE SKIDS  (Snow)
Level 5: PEACHES    (Desert)
Level 6: LIVERPOOL  (City)
Level 7: BAGLEY     (Marshland)
Level 8: E BOW      (Storm)

Cheats (enter as stage codes):

TURPENTINE = time no longer matters
DEESIDE    = placements no longer matter
DUX        = sub-game (Shooting Gallery)