New Super Mario Bros. Wii Online Multiplayer? Not Official—But Mods Exist

The original New Super Mario Bros. Wii (2009) has zero online multiplayer. It supports local co-op for 2–4 players on one Wii—same screen, shared camera, chaotic fun. No Nintendo Wi-Fi Connection, no friend codes, no matchmaking.

What You Can Do Officially

• Local Co-op: 4 Wii Remotes (or Wii Remote + Nunchuk / Classic Controller). Best way to play.
• Stream & Share: Broadcast via Twitch/YouTube. Viewers watch; they don't play.
• Wii U Virtual Console Version: Same game, same local-only. Off-TV play on GamePad.

Unofficial Online Mods (Homebrew Required)

Requires: Homebrewed Wii (Homebrew Channel) or Wii U (vWii). Not supported by Nintendo. Risk of ban if used online with official services.

• New Super Mario Bros. Wii Netplay (Dolphin Emulator): Best experience. Two PCs running Dolphin + Netplay build. Low latency, save states, 1080p+.
• Wii Network Mod (Wiimmfi + Custom Tracks): Wiimmfi replaces Nintendo WFC. Some custom mods add lobby systems—but NSMBW wasn't designed for netcode. Desyncs, lag, crashes common.
• Kazowar's NSMBW Online Mod: Community project. Injects netcode via Riivolution. Experimental.

Better Alternatives for Online Mario

• Super Mario Bros. Wonder (Switch): Full online co-op (2023).
• Super Mario Maker 2 (Switch): Share levels, play together online.
• New Super Mario Bros. U Deluxe (Switch): Local 4-player, no online—but better physics, more content.

Original NSMBW = local only. Want online? Emulate with Dolphin Netplay, or buy a Switch game built for it.