Activation through the website
In order to activate your Product key or Gift card on the Nintendo website, follow these steps:
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Log into your Nintendo account (You can create one here).
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Go here for quick access to the Nintendo Product key and Gift card redemption page.
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Simply paste the provided code into the designated area and press the Next button.
Activation through the console
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Select Nintendo eShop on the HOME menu to launch it.
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Select an account on which you would like to redeem the code.
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Select Redeem Code on the left side of the screen and then enter the provided 16-character code.