Enter HEDGEHOG0 as a name; don't press [Enter]. The sound of an engine rev will confirm that you've enabled cheat mode. Now press [Backspace] to return to the first letter of the name. Enter one of the following names to activate their cheat. Now if you want to enter more codes, don't press [Enter] after the previous code confirmation. Once again, press [Backspace] to return to the first letter and enter another name (code).
Note: The cheats will not be work in practice mode.