With the second star on Bob-omb Battlefield (Koopa the Quick Race), you can use the warp glitch in the game. You will not be considered a cheater by using this trick. (Apparently, Koopa the Quick doesn't know about the warp trick.) The only way you will be considered a cheater is if you use a cannon. When you get to the top, whether Koopa the Quick beats you or not, you will be considered a cheater and will lose the race. Otherwise, good luck!