Playing GameCube Games on Wii: GameCube Controller Required

Yes, you must use a GameCube controller (or compatible alternative) to play GameCube games on a Wii.

Why?

• The Wii's native Bluetooth/USB HID stack does not expose GameCube controller port signals to Wii software.
• GameCube games run in a hardware "GameCube mode" (clocks down CPU/GPU, locks out Wii peripherals). Only the physical GameCube controller ports (on top/front of original RVL-001 Wii) are active.
• Wii Remote, Classic Controller, Pro Controller, Wii U Pro Controller — none work for GameCube games.

Options

• Original Nintendo GameCube Controller (Wired): Best latency, authenticity. Plug into Wii's GC ports.
• WaveBird Wireless (with receiver dongle in GC port): Works perfectly.
• Third-party wired GC controllers (HORI, PDP, etc.): Budget option; check reviews for stick quality.
• GC Controller Adapter for Wii U / Switch (Mayflash, 8BitDo, official): Does not work on Wii. These are USB for Wii U/Switch/PC only.

Note: The Wii Family Edition (RVL-101) and Wii Mini (RVL-201) lack GameCube ports and cannot play GameCube games at all (discs won't read, no ports, no GC mode).