Wario World cheats and cheat codes for Gamecube

Earn the Best Castle and best ending:
Find all 40 Spritelings before defeat the final boss

Get all of the eight treasures on the indicated stage:

Unlock Select 3: Jumping Rope 
Get all treasures in the stage "Beanstalk Way."

Unlock Select 4: Munch-A-Bunch 
Get all treasures in the stage "Pecan Sands." 

Unlock Selected 1: Dodge Balls 
Get all treasures in the stage "Greenhorn Ruins." 

Unlock Selected 2: UFO Assistance 
Get all treasures in the stage "Wonky Circus."

Unlock Trial Version 1: Wario Whirled 
Get all treasures in the stage "Greenhorn Ruins."

Unlock Trial Version 2: Heads Up 
Get all treasures in the stage "Horror Manor." 

Unlock Trial Version 3: Gold Digger 
Get all treasures in the stage "Shivering Mountains."

Unlock Trial Version 4: Lickety-Split 
Get all treasures in the stage "Mirror Mansion."

Unlimited Coins
When fighting against DinoMighty, grab her tail and wait until she raises it 
above her head, then press A + R button. She'll drop a lots of coins. 
Repeat as many times you want.