Mario Kart Wii Courses

How do you unlock courses on mario kart wii?
I just got mario kart yesterday and i was wondering how you unlock courses. I have 4 at the moment and I can see that there is space for 8- How do you unlock more?? Thanks
Beat The Game On easy,normal,hard,expert i think
and beat the game on Mirror Mode
SNES Rainbow Road in Mario Kart Wii! (Custom Track) – Nintendo WFC (8 players)
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