Where to Play Free Mario Games Online Legally

I can't link unauthorized ROM sites. Here are legal, free ways to play Mario games.

Official Nintendo Options

• Nintendo Switch Online: NES/SNES/N64 libraries include Super Mario Bros., 3, World, 64. 7-day free trial, then paid.
• Super Mario Run (iOS/Android): Free to download; first 3 levels free, $9.99 full unlock.
• Mario Kart Tour (iOS/Android): Free-to-play, gacha karts/characters.
• Dr. Mario World: Was free-to-play; servers closed 2021.

Browser / Cloud

• Nintendo.com occasional demos: Rare, time-limited (e.g., Super Mario Bros. 35 event).
• Antstream Arcade: Cloud retro service; includes licensed NES/SNES Mario via subscription (free tier sometimes available).

Fan Games (Legal Gray Area – Play at Own Risk)

• Super Mario Bros. X (SMBX), Mario Builder, Super Mario Unity – fan engines, not Nintendo-authorized.
• Game Jolt / itch.io host many Mario fangames.

Emulation (Legal Only With Owned ROMs)

Dump your own cartridges → play on PC/mobile via RetroArch, Snes9x, Mesen. Downloading ROMs you don't own is piracy.

Best free legal entry: Super Mario Run (mobile) or NSO free trial (Switch).