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To play Super Mario Bros online, follow these simple steps:

Super Mario Game

Super Mario Bros online

Plays Super Mario Bros. Game

Choose a Platform: Use an official emulator like Nintendo Switch Online (for the classic NES version) or find a reputable browser-based emulator (such as those on sites like ClassicReload).

Use an Emulator: If playing on PC, download a trusted NES emulator (e.g., FCEUX) and a Super Mario Bros ROM (ensure it’s legal if you own the original game).

Browser Games: Some websites host free online versions—search for "Super Mario Bros online" and pick a safe site.

Controls: Use keyboard arrows (or configure a controller) for movement, and assign keys for running (B) and jumping (A).