How to Play Wii Games on Wii U

There is no device called just "U." You likely mean the Wii U, Nintendo's 2012 successor to the Wii. The Wii U offers near-full backward compatibility with Wii software.

How to Play Wii Games on Wii U

1. Wii Mode: From the Wii U Menu, select the "Wii Menu" icon (looks like a classic Wii remote). This reboots the console into a virtual Wii environment.
2. Discs: Insert your Wii game disc. It appears as a channel on the Wii Menu. Click to launch.
3. Digital (WiiWare/Virtual Console): If you purchased digitally on Wii and did a System Transfer to the Wii U, they appear in the Wii Menu. You cannot buy new Wii content on Wii U eShop (Wii Shop Channel closed 2019).
4. Controllers: You must use original Wii Remotes (+ Nunchuk, Classic Controller, Balance Board). The Wii U GamePad cannot control Wii games (it acts only as a screen/mirror in Wii Mode).
5. Video Output: Wii Mode outputs 480p (via HDMI on Wii U), often looking sharper than on original Wii (480i/component).

Limitations

• GameCube Games: Not supported natively (no GC controller ports, no memory card slots). Homebrew (Nintendont) enables this.
• Wii Speak / USB Accessories: Most unsupported.
• Save Data: Stored in Wii Mode's internal NAND (separate from Wii U saves). Back up to SD Card via Wii Menu → Data Management.

If you meant a custom PC ("U"): You'd need an emulator like Dolphin (highly accurate, requires decent PC) and a legal game dump (ISO/WBFS from your own discs).