Cheat mode
Enter one of the following codes during game play to activate the corresponding cheat function:
[TAB] + 2 + L - Extra Life
[TAB] + 2 + F - Full Fuel Refill
[TAB] + 2 + I - Invincibility
[TAB] + 2 + S - Skip a Level
Hints
Unlimited lives
There should be an extra life directly under you once the second level begins. Collect it, then go straight to any monster and let it kill you. Each time you get 1000 points, you get an extra life. Repeat this to build your points and extra lives.
Fast snow
In the Christmas Edition, hold down [S] at the title screen to make the snow fall really fast and build up quickly.