Mario World: Overrun

Mario World Overrun is a fan-made Mario game for the browser. The basic gameplay is shooting all the enemies before they destroy your castle. Your choice of weapons to purchase are a magnum, a uzi, a shotgun, a assault rifle, and a plasma assault rifle. You may also purchase ammo and special weapons. You can chose between 4 difficulties, easy, medium, hard, and insane. The difficulty levels change things such as how many coins (money) you start with, how much you damage the castle upon shooting it, and how smart the AI is. You shoot Goombas, Koopas, Boos, etc. A remixed version of the Super Mario Bros theme plays in the background.