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Nintendo 64 - Mario Kart 64 cheats

Unlock mirrored courses in GP mode:
Win 1st place in the 150cc class, after reset your Nintendo 64 system. 
If done correctly, the title screen should be change.
View time trial record
Hit R at the title screen

Course ghost racers
Beat the time trial mode less than the indicated time.

Course - Time   
Mario Raceway - 1'30"00
Luigi Raceway - 1'52"00
Royal Raceway - 2'40"00
                         
After, select "Retry" option to race again. "Now Meet the 
Course Ghost" text should be appear.