Use left and right arrow keys, or A and D to move Mario. Don't let the Goomba touch the ground, or else you will lose! There are 3 levels. If you do lose, double click the green flag, or else the game will glitch out.
I used sprites and sound effects from my older projects, but I also used http://themushroomkingdom.net/wav.shtml Please check out my other games too! Sorry that the punching animation for Mario is a little buggy. It doesn't always work, but I can't figure out how to make it work properly, and I don't feel like messing with it anymore, so it's fine.