Cheat mode:
Hold L + R + X + Y + click-hold left analog stick. Then click + hold right analog stick on controllers one and four simultaneously at the Character screen. If the combination has been entered correctly you will hear a confirmation voice and all drivers, taxis and courses will be unlocked.
Expert mode:
Simultaneously press and hold White and Black and then press A.
All Drivers:
Successfully complete Crazy X Level S-S
Bonus Courses:
Successfully complete Crazy X Level 1 to unlock the West Coast Glitter Oasis and Small Apple courses.
Bonus Taxi:
Successfully complete Crazy X Level 2 to unlock the bike, stroller and carriage taxis.
Another Day mode:
Successfully complete Crazy X Level 3