The Wii Shop Channel has functionality to allow games to be updated. This has been used four times so far to update "Military Madness", "Star Fox 64/Lylat Wars", "" (in North America and Europe), and "Mario Kart 64" (in Europe and Australia). Several NES and SNES games released before March 30, 2007 have also been given updates in Europe and Australia to fix previous problems with the Wii component cables. These updates are free of charge to those who have downloaded a previous version of the game.