This page contains Ben 10: Protector Of Earth Hints for Nintendo DS called "Special Challenge" and has been posted or updated on Nov 4, 2008 by shimmer. Let us know what you think of this Hint by thumbs voting.
At the level select screen enter the following Left, L button, right, R button, Up, Down, Select button you have to do this fast and listen quite hard. If you hear a sound kinda like the omnitrix making Ben a alien you know... it sounds a little like an explosion if not keep trying when it does work it shall reveal a challenge go to Vilgax's ship look next to it there should be a orange Omnitrix sign go to it and you should be able to play it.
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