Play Super Mario Bros. (1985) on PC: Legal Methods

Official / Authorized

• Nintendo Switch Online + Expansion Pack: Includes NES library (SMB1) playable on Switch/PC via browser (cloud streaming beta) or native Switch app.
• Super Mario Bros. 35 (Delisted): Was free for NSO subscribers.
• NES Classic Edition / SNES Classic: Hardware includes SMB1; can dump own ROM legally.

Emulation (Legal Gray Area – Own Cartridge Required for ROM)

1. Emulator: Mesen (most accurate), FCEUX, Nestopia UE, RetroArch (Mesen core). All free, open-source, cross-platform.
2. ROM: Dump from your own cartridge using Kazzo / INL Retro Dumper or Retrode. Downloading ROMs ≠ legal in most jurisdictions (even if you own cart).
3. Play: Load ROM in emulator. Map keys/controller. Save states, rewind, filters.

Browser-Based (No Install)

• JSNES (jsnes.org): JavaScript NES emulator. Load ROM file (drag-drop).
• RetroArch Web: WASM cores.

Modern Remakes / Ports

• Super Mario Bros. (Game & Watch) – Official Nintendo handheld re-release.
• Super Mario Maker 2 (Switch): Play/recreate SMB1 style levels.
• Super Mario All-Stars (SNES/Switch NSO): 16-bit remake with save.

Best Experience: Mesen emulator + dumped ROM + CRT shader + original controller adapter. Or NSO on Switch.