Star Wars Trilogy - Apprentice of the Force - Platform: Gameboy Advance

Level select:
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Finish the game.

Secret level:
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Finish the game, and in the level selection screen you will be able to pick a 
new, secret, level.

How to Defeat the Rancor:
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This isn't really a code, but this tip will help you defeat the rancor. 
Bide your time by dodging the rancor's grip. Gammoreans will help distract 
the rancor, if they're behind the rancor's back. When you find some rocks, 
roll past him ( down + a), and roll under again when the rancor's near the 
door that kept him trapped. Use force push ( r + b) on the rocks, then when 
the rancor is right below the door, force push again, then the rock will hit 
the switch to the door, killing the rancor.