1. Purchase New Super Mario Bros. U on Wii U: If you have a Wii U console, you can purchase New Super Mario Bros. U directly from the Nintendo eShop or retail stores.
2. Nintendo Switch Online: The Nintendo Switch offers a growing library of classic games, including some Mario titles. While New Super Mario Bros. U is not currently available on the service, it's worth keeping an eye on the lineup.
3. Re-release or Remaster: In some cases, games are re-released or remastered for newer consoles. Keep an eye on Nintendo's announcements for potential re-releases of New Super Mario Bros. U.

It is important to clarify that New Super Mario Bros. U is a Wii U game and there is no official or "verified" version that runs natively on the original Wii hardware. Purchase New Super Mario Bros

• Purchase the game officially: To ensure a safe and legitimate gaming experience, consider purchasing New Super Mario Bros. U through official channels.
• Be cautious when downloading ROMs: If you still choose to download ROMs, be aware of the potential risks and ensure that you're downloading from reputable sources.

Since an official "U" ROM does not exist for the Wii, the community uses ROM Hacks to port the experience. These hacks modify the 2009 New Super Mario Bros. Wii ISO to include levels, assets, and mechanics from the Wii U sequel.