How To Fix Scrached Up Wii Games?

Get a CD cleaner or go to a CD cleaning place. You could also bring the game to the place you got it or nearest vidio ame store, depends on the damage done.
If the scratch is really bad I have had success with car scratch remover followed by car polish. Use a clean damp cloth and apply the scratch compound from the center outwards until the scratch fades ( you will have to wipe off the haze to check). After this is done just apply polish in the same manner and then buff it off with a clean dry cloth. This worked to repair an unreadable Mario Galaxy disc for me when all the other suggestions failed.