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Nintendo 64 - Doraemon 3 cheats

Faster buggy in mini-game:
If you lose in the water buggy race game, hit R + A + B 
while the screen fades to white.

Unlock Princess Corona:
Finish the game in any difficulty level. Watch the ending movie, save 
and go back to the title screen. Load back your cleared saved game 
file to unlock the Princess.