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The Moon:|

Difficulty: 5/5
Record: 800/2000 m 200.000 pts
Bonus Mileage: 8000 m
Points needed for a 1-Up: 300.000

The Moon is pretty much the same as America: Both have the same depth, the 
same general layout for every stage, the same gravity and air consumption, 
hence you don't need two separate full-fletched guides.
The only difference between the two levels are the ?-boxes scattered 
throughout every stage of The Moon.
These neat items have ten different effects that are randomly chosen each 
time you pick up one. So you never know if a ?-box will help you or maybe 
renders your trip impossible by cutting your air reserve in half for example.
If you leave out this item for the whole level you can absolutely play The 
Moon as you did America but in my opinion the ?-boxes make this level way 
more interesting than any other level (except for Outer Space) hence you 
should pick them up.
Actually in most cases you will receive a positive effect so when one of 
these yellow goodies lies near you and is easily accessible, go get it except 
for when you've nearly made it to the end of the level and feel like being 
able to do it without any special boost since you'd want to bite your DS if 
you'd happen to get an X-Creator-box blocking your way on the last few meters.