110V Wii on 220V Outlet: Will Not Work Without Converter

No. A 110V (NTSC-U/C) Wii plugged into 220V will be damaged or destroyed.

Why

• The Wii's internal power supply is not universal voltage. It's designed for 110–120V only (Japan/US/Canada).
• 220–240V (Europe, Asia, AU, etc.) will overload the primary side of the transformer, causing immediate failure, smoke, or fire.
• No auto-switching, no hidden jumper.

What You Need

1. Step-Down Voltage Converter (Transformer): 220V → 110V. Must be rated ≥ 50W (Wii draws ~18W, but inrush + margin).
2. Not a "travel adapter" (plug shape only). Those do not change voltage.
3. Original Wii AC Adapter (RVL-002) rated 120V — plug it into the converter's 110V outlet.

Better Alternative

• Buy a local-region Wii (PAL, 220V native) or a universal-voltage Wii power supply (third-party, e.g., Nyko, Insten — verify 100–240V input).
• Wii U / Switch: Both have universal power supplies (100–240V) — just swap the AC cable (figure-8 / USB-C).

Safety first: Wrong voltage = fire hazard. Don't guess. Use a proper step-down transformer or native hardware.