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You're looking for a guide on how to download a ROM of "New Super Mario Bros. Wii Retro Remix" from 2021. I must emphasize that downloading ROMs of games without owning the original copy can be considered piracy and may be against the terms of service of the game and the platform it's on.

That being said, here's a general guide, focusing on the process rather than endorsing piracy:

What You’ll Need

  1. A physical or digital copy of New Super Mario Bros. Wii – Legally owned. Use your own disc or a NAND backup from your Wii/Wii U.
  2. A Wii console or a Wii emulator (Dolphin) – Dolphin is legal and open-source.
  3. The Retro Remix patch files – Usually a .ppf or .xdelta patch. You can find these on ROM hacking forums (e.g., GBAtemp, Romhacking.net). The patch itself is legal because it contains no copyrighted Nintendo code.
  4. Patching software – xdeltaUI, NUPS, or Floating IPS.

2. New Super Luigi U (Wii U / Switch)

Harder, tighter level design that feels like a fan hack – but official.

Alternatives

The Hard Truth: Downloading “Retro Remix ROM” Is Risky

Let’s address the elephant in the Koopa Clown Car. When you search for a “ROM download” for New Super Mario Bros. Wii Retro Remix, you are essentially looking for:

Distributing or downloading that combined file is illegal in most jurisdictions under copyright law. Nintendo has successfully sued ROM distribution sites for millions. While fan creators themselves are rarely targeted, end-users who download from peer-to-peer networks expose themselves to:

1. Super Mario Maker 2 (Nintendo Switch)

Build your own retro-style levels using NSMBU assets. Thousands of user-created “classic remix” levels exist online.