Enable All Options:
Don't press any buttons on the Title Screen. When the first character stat screen appears, press Z, B, A, L, A, Z. The red and blue question mark icons will appear. This code will open up the abilities to have free play, have two secret characters (Khameleon and Smoke), and many others. If you enter the code correctly, you'll hear a voice say, "Perfect!" Start the game normally and all the options will have been enabled.