New Super Mario Bros. Cheats

Play as Luigi in Single-Player
Hold L + R and press A to select a saved game file to play as Luigi in single player mode.
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Unlock World 4
Defeat the Boss in the last castle of World 2 as Mini Mario.
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Unlock World 7
Defeat the Boss in the last castle of World 5 as Mini Mario.
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Secret Challenge Mode
Complete the game and start the cleared game file. Press Start to pause the game at the world map. Press L, R, L, R, X, X, Y, Y. The message Welcome to the Secret Challenge mode will appear to confirm the cheat has been activated. To indicate whether a level has a Secret Challenge version, the new right arrow icon will be lit in the top right corner of the map screen.
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Note: Because nGaming does not have all games for Nintendo DS, it is not possible for us to verify that each of the New Super Mario Bros. cheats above is correct. If any of the cheat codes, tips, hints, glitches, walkthroughs, FAQs, easter eggs or unlockables listed above is incorrect, please rate the cheat using the link just below the cheat information. Please note that in a minority of cases, some cheats will only work in certain versions (PAL, NTSC etcetera) of the game. Also, please be aware that it may be the case that nGaming does not yet have all of the New Super Mario Bros. cheats yet - if you know any hints or tips for New Super Mario Bros. on Nintendo DS, we would greatly appreciate it if you could submit the cheat so we can add it to our database.