Mario Kart: Double Dash! on GameCube played its part in shaking up home console racing in the iconic karting series, while Mario Kart DS introduced online play in what was just the second portable entry. These were solid foundations for Mario Kart Wii to build upon.
Ultimately it was a release that would introduce a host of new ideas to the franchise, primarily utilising the Wii's features which weren't available on previous hardware. Online play was prominent, including online Battles, but this entry also included its own Wii Channel in which you could view and challenge ghost Time Trial times and check rankings.