Ghost Racers

In some courses, if you defeat a certain time in the Time Trials, you'll be able to race against a hidden ghost on that track. Here are the 3 courses that have ghosts:

Luigi Raceway

Get under 1:51:00 to race against Luigi!

Mairo Raceway

Get under 1:30:00 to race against Mario!

Royal Raceway

Get under 2:40:00 to race against Peach!

Note: If you're having trouble beating these times, you might want to check out the tips on the tracks back at the course maps section for mega shortcuts and tons of tips.