Mario Kart 64 cheats and cheat codes for Nintendo 64

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.