Nintendo Wii

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I'm thinking of purchasing a Nintendo Wii from the US on eBay. I live in the UK and want to know if the games for Wii are region-locked or region-free. Is there one universal region for Wii games or like other consoles are there US, European and Japanese versions to the games which would mean if my console is US then the UK/Europe Games sold here would not work on the Wii - is that right?