Early models of the Wii were backward-compatible with all Nintendo GameCube games and accessories (Except The Gameboy Player). However in late 2011, a reconfigured version of the Nintendo Wii, the "Wii Family Edition" was released. This version removed the Nintendo GameCube compatibility. The same thing applies with the Wii Mini.
Although currently sold in North America, its original model has been discontinued in Europe (along with its Family Edition model) and in Japan since 20 October 2013. As of 20 May 2014, the Nintendo Wi-Fi Connection service has been discontinued for the Wii, and instead replaced by the Nintendo Network for the Wii U.
The Virtual Console (often abbreviated as VC) is a section of the Wii Shop Channel that offers titles released on past consoles. Several Sonic the Hedgehog games were released on this service. The Wii was the first console to offer this service, with the Nintendo 3DS and Wii U later adopting the service. Nintendo discontinued the Wii Shop Channel in 2018.
A smaller, redesigned model called the Wii Mini is released on 2 December 2013 in Canada, 15 March 2013 in Europe and on 17 November 2013 in the US. Unlike the Wii, it lacks internet connection, Nintendo GameCube backward capabilities, has only one USB Port and some features. The Wii Mini was sold for at least US/CA$99.99. The Wii Mini was discontinued worldwide in 2017.
Sonic the Hedgehog 4: Episode I is the only Sonic game to be released on WiiWare, as its sequel, Sonic the Hedgehog 4: Episode II was released on other consoles and not to the Wii due to the WiiWare's hardware constraints.
According to Yojiro Ogawa, a port of Sonic the Hedgehog (2006) was originally going to be released on the Wii. However, due to the differences in hardware, Sonic and the Secret Rings was made instead.
Sonic Generations was also planned to be on the Wii, but was scrapped due to hardware issues.
In 2008, a Wii remote holder of Sonic was going to be made by First 4 Figures, but it was canceled.