Various Shortcut Codes
Pressing various button combinations during the power-on process or at other specific times when using the console allow you to quickly change certain settings. Some of these are known and included in the manual, but others are completely hidden to the user.
Effect Code Adjust the system brightness While playing GBA/DS titles - hold the Home and Start Buttons and press Up/Down Allows you to play the game in the original resolution (with a system border on non-DS titles) While starting a GB, GBC, GBA, or DS game - hold Start Calibrate the motion sensor While at the Home Menu - hold B and Y Console boots to the Circle Pad calibration menu While the console is off - hold L, R, and Y, and power it on Console boots to the system update menu. You can opt into an update or not, and either way the console powers off after. While the console is off - hold A, L, R, and Up on the D-Pad and power it on Console boots to the Touch Screen calibration menu While the console is off - hold L, R, and X, and power it on Console boots up to play the inserted 3DS game without actually setting up the console While booting up a system that isn't set up, with a 3DS game in the slot - hold A+B+X+Y+R and power it on Switch between Controllers 1 and 2 While playing NES titles - press L+R+Y Switch the color tinting of the screen between grayish and greenish hues While playing GB titles - press L+R+Y Toggle the power-saving mode While playing GBA/DS titles - hold the Home and Start Buttons and press Left/Right
Contributed By: Eevee-Trainer.
Hidden Breakout game (New 3DS Models Only)
In the internet browser's new page screen, tap the touch screen six times to the tune of the first six notes of the classic Super Mario Bros. overworld theme. The text "Favorite Bookmarks" will change to "STAGE SELECT" to confirm correct entry. Now choose any site you have bookmarked to play a hidden breakout game, with the blocks arranged to form the chosen site's URL.
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You can submit a problem report for any non-working or fake code in the lists above.