Helpful tip for 3DS: If you‘re in DSi mode and need to adjust the brightness, press the HOME button, then hold START, now press UP or DOWN on the D-PAD to change the brightness lvl. Finally, press B to return to your game. ☆
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I tried and it works, then i wasted an hour trying to beat kirby super star ultra's true arena with different abilities... Jet, mirror, yo-yo, and ice are pretty powerful ngl
btw you can also press LEFT/RIGHT to disable/enable Wi-Fi on DSi mode