To unlock the following, complete the following tasks:
Unlockable: --- How to Unlock:
BOUN-C --- Finish Area 1
FEMI-9 --- Finish Area 4
FROS-T --- Finish Area 3
MUSS-L --- Finish Area 2
NEME-6 --- Finish Area 5
TREZ-R --- Finish the Extra Area
Unlock "The Extra Area"
You have to complete Area 5 to unlock "The Extra Area"
Various Gameplay Tips
Each level contains a flag time you'll attempt to beat for further points. Be careful for levels created by alternative players on-line - hopefully, a number of those can prove a lot of fun than those provided within the campaign.