This page contains Super Mario Brothers DX Unlockables for Gameboy Color called "You vs. Boo bonus levels" and has been posted or updated on Apr 20, 2007 by mrclean214. Let us know what you think of this Unlockable by thumbs voting.
You vs. Boo bonus levels
Score at least 100,000 points during game play. Then, select Boo as a character at the title screen.
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