Wii de Yawaraka Atama Juku - Platform: Wii

Expert Difficulty:
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Get a Gold Medal under the Easy, Medium and Hard difficulty settings on 
one exercise to unlock the Expert difficulty setting for the same 
exercise.

Free Platinum Medal:
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Quit out of the game four times in one minute (sixty seconds), and you 
will automatically earn a Platinum Medal.

Medals Breakdown:
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Here's a breakdown on how all of the medals in the game are determined: 

100g Brain - Bronze Medal 
200g Brain - Silver Medal 
300g Brain - Gold Medal 
400g Brain - Platinum Medal 

Platinum medals are determined by difficulty settings: 
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Easy Level   - 400g 
Medium Level - 450g 
Hard Level   - 475g 
Expert Level - 500g

Platinum Medal:
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To earn a Platinum Medal, get a score of 450 or higher.