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You can create a Nintendo Account using your smart device or computer for free here.
Notes
・ You will need an e-mail address to create a Nintendo Account.
・ We recommend using an e-mail address that you will continue to use in the future.
If you lose access to your e-mail address, you may not receive important notifications.
・ If the steps above do not take you to the account-creation page, you may be signed in with another Nintendo Account. If so, please sign out and try again.