Donald Duck - Goin' Quackers - Platform: Dreamcast

Earn New Costumes 
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To earn a new costume for a particular area, beat Gladstone's time in 
all four stages to get a new costume from Donald. You meet Gladstone 
in the level that Huey, Dewey, or Louie were blocking. 

Switch Costumes 
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If you have earned more than one costume, you can return to Gyro's Lab 
and in the corner on the far left is a machine that will let you choose 
a different costume to wear. 

Special move
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Quickly collect five cogs to get one letter from the word "SPECIAL" in 
any level. Keep collecting cogs until the entire word is spelled out. 
Complete the level to learn a special move. 

Defeating Merlock
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After the Merlock splits in four, attack the one that has the shining 
diamond.