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Nintendo Wii - Big Brain Academy: Wii Degree cheats

Unlock the Expert difficulty level:
Win a Gold Medal under the Easy mode, Medium mode and Hard mode 
on one exercise to access to the Expert mode for the same exercise. 

Unlock Bronze medal: Reach 100g brain size
Unlock Silver medal: Reach 200g brain size
Unlock Gold medal: Reach 300g brain size
Unlock Platinum medal: Reach 400g brain size

Earn Platinum medal easily:
Quit the game 4 times in less than 60 seconds to automatically get a 
Platinum medal.