You need a paid membership to Nintendo Switch Online to play

Nintendo Switch Online 12-Month Individual Membership [Digital Code] : Everything Else

Nintendo Switch Online membership price, games list, features and more

Level up with a Nintendo Switch Online Membership - Nintendo Official Site

Nintendo Switch Online - Nintendo - Official Site

Nintendo Switch Online - Nintendo - Official Site

You'll need to PAY to play Nintendo Switch online from next week

Nintendo Switch Online 12-Month Individual Membership [Digital Code] : Everything Else

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Nintendo Switch Online - Online Play - Nintendo

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FAQ, Nintendo Switch Online

Nintendo Switch Online's N64 and Sega Genesis 'expansion pack' launches October 25th for $49.99 per year - The Verge

Level up with a Nintendo Switch Online Membership - Nintendo Official Site

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Get Ready To Pay For Nintendo Switch Online Play