Landing upside down:

Upside down landings are Allowed on level 6.

Bonus points:

Activate the afterburners as you enter the canyons on level 4 to receive a "Gutsy" bonus of 30,000 points. Activate the afterburners again immediately before entering the second set of canyons to receive a "Lunatic" bonus of 65,000 points. The bonus points are added to your score after landing.

Level - Password

1 - AAAA
2 - PLAN
3 - AlFA
4 - BELL
5 - NINE
6 - LOCK
7 - HAND
8 - FLEA
9 - LIFE