You need a paid membership to Nintendo Switch Online to play

With a Nintendo Switch Online membership, you'll get access to online play in compatible games, an ever-growing catalog of classic NES™, Super NES™

Nintendo Switch Online 3-Month Individual Membership (Digital)

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

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

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

Nintendo Switch Online - Every NES, SNES, N64, Sega Genesis, Game Boy, And GBA Game Available

Nintendo Switch will have a paid online service starting this fall - Polygon

Nintendo Switch Online - Online Play - Nintendo

You'll have to pay to play Nintendo Switch games online — except for 'Fortnite' (NTDOY)

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

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

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

Nintendo Switch ONLINE – The BEST Gaming Membership?

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