This page contains New Super Mario Bros. Unlockables for Nintendo DS called "Challenge Mode" and has been posted or updated on Nov 23, 2006 by Dragonslayer666. Let us know what you think of this Unlockable by thumbs voting.
Once you've beaten the game go to the world map it doesn't matter which world. Then press the start button to have the pause menu coming up. Now press the following buttons in the exact same order to activate the secret challenge mode. L, R, L, R, X, X, Y, Y(these are the buttons you have to press). One the Challenge Mode is activated enter a level of your choice doesn't matter which one. You'll notice that the screen will scroll through the level so that means that you can't return if you missed some coins or something. To de-activate the challenge mode repeat the same procedure as described above.
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