Unlimited Ammo 
Hit 50 Barrels during Challenge 18 
 
Unlimited Health 
Hit 179 barrels during Challenge 17 
 
Unlimited Turbo 
Get eight Zappers during Challenge 4
 
Unlock All Cars 
Hit 11 Bonus Stunt items while completing Challenge 8
 
Unlock All Items 
Hit 30 Barrels during Challenge 7 
 
Unlock All Worlds 
Find the Hidden Key in Challenge 18
 
Upgrade Your Laser 
Complete Challenge 18 on very hard difficulty