The Scratch forums are not a good place to ask these questions. You could try using Google.
But anyways, you use a friend code to register your friends on the 3DS, and vice versa.
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To find your 3DS friend code, start up your 3Ds, tap the square smiling thing on the top of the touch screen, go to yourself, and your friend code is at the bottom right of your portrait.
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Since it appears to be a question about playing with the 3DS system, this seems like a pretty good fit for the topic.
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CheckItNow12 wrote:
The Scratch forums are not a good place to ask these questions.
Just got TOLD.
But yeah. lol.
What these guys said.
Friend codes are for playing with friends.
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