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Note: This requires a New 3DS model. Display the internet browser's new page screen, then tap the touch screen six times to the rhythm of the first six notes of the classic Super Mario Bros. overworld theme song. The text "Favorite Bookmarks" will change to "STAGE SELECT" to confirm correct code entry. Select any bookmarked site to play a hidden Breakout mini-game, with the blocks arranged to form the selected site's URL.
Classic Game Boy mode in Virtual Console
Begin playing a Game Boy game in the Virtual Console. Hold L + R and press Y to change the colors from black and white to the classic green LCD palette. Repeat the code to disable its effect.
Have ambient music playing while the system displays a game cartridge at the home menu. The cartridge will "dance" to the music that the system's microphone picks up.
Unlimited Play Coins
Once you get your 10 Play Coins for the day, go to "System Settings" Under "Other Settings", go to "Date And Time". Change the date to one day ahead, save the change, then go back to the current day. You can now get another 10 Play Coins. This trick will work numerous times in a day.
Control main menu
When you blow into the mic, whatever is on the top screen on the main menu (except for "Health & Safety Information") should start spinning, and the title goes up.