Various Codes
Type 'JUNKYARD' after pausing the game. After this press the 'Return' key and the following:
Code - Effect
RETURN - Cheat Mode On/Off
F10 - Flashing Borders
F7 - Increase Speed
Z - Level 03
X - Level 04
C - Level 05
V - Level 06
B - Level 07
N - Level 08
M - Level 09
D - Unlock all locks