Before trying this cheat you will need to get the cheat menu box, which is already on this page. On Mount Mayham, when you are coming out of the snow tunnel into the green forrest area there is a flower box on the right hand side behind on of the tree's. When you hit the box you should hear "GROOVY". If you hear it, finish the race and go to the cheat menu and you should see "COLOR CHANGING" in the single race mode.