Original Mario Bros. will support online co-op through Nintendo Switch Online

Nintendo promised online-enabled NES games as part of the Switch Online service, and the company today gave one example…

Join Mario, Luigi, and pals for single-player or multiplayer fun anytime, anywhere! Take on two family-friendly, side-scrolling adventures with up to

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Game sharing on the switch allows both people to play at the same time. (more info in the comments) : r/NintendoSwitch

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