New Super Mario Bros. Glitches

Koopa Kick
The glitch is very hard to do. First, go to world 2-4. Once at the end of the level, you will see a green koopa going down the staircase. You have to jump on it but not yet. You need to get on the corner of a block ( on the corner of a stair ). When it comes, jump on it. Then, quickly jump again and if Mario starts to jump on his own while kicking the shell, let him go. He will start making extra lives because Mario is actually jumping on it altogether even as if it looks like he is not. You can get up to 99 lives from only having 1 life left.