In Super Mario Bros 3. If you use Game Genie Codes and you type in: OXKIPZOS and APKSALAZ. You can move everywhere on the map! And if you go to World 4 and enter the bottom left flower. Sometimes it chrashes your game but if not, you will enter the stage! But you will likely fall to your death unless you use a P-Wing or use a Game Genie Code that lets you jump in the air. You can only see a weird glitch line. For some reason. The map tiles are counted by levels, most of them will crash your game