Super Mario Advance 3 - Yoshi's Island - Platform: Gameboy Color

Hard Mode
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You must get 1000 points in a world (100 points on all levels, 
Extra and Secret included) to make a star appear on the 'Select 
Game' screen. If you get 5 stars you will be able to play Yoshi's 
Island on Hard Mode. 

Bandit Mini-Games
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To use the Bandit Mini-Games any time go to the stage select 
screen, hold select and then press L, L, B, A, R. You will be 
taken to a screen with all six games where you can get unlimited 
power-ups. 

Unlock 6 Secret Levels
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Complete the game with 100% on all 8 levels to get 6 levels not 
found in the original Yoshi Island. 

Secret Ending
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You must get 6 stars (100 points on all 60 levels, for 6000 points) 
then beat the game to see the secret ending. 

Bonus Games
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To unlock mini-games to play at your own free will, simply get a 
score of 700 or more for a world. The bonuses for each world are: 

World 1: Flip Card's 
World 2: Drawing Lot's 
World 3: Scratch n' Match 
World 4: Match Cards 
World 5: Roulette 
World 6: Slot Machine.