Hit 11 Bonus Stunt items while beating Challenge 8.
Hit at least 30 barrels while beating Challenge 7.
Get the Hidden Key while beating Challenge 18
Beat Challenge 18 on the Very Hard difficulty setting.
Hit at least 50 barrels while beating Challenge 18
Hit at least 179 barrels while beating Challenge 17
Get 8 zappers while beating Challenge 4.
Beat all of the Adventure Mode levels.
