This is to demonstrate how to make an auto-scroll level, just like in Super Mario Bros 3. Press c to jump, up arrow to look up, space for dash, and down arrow for crouchig. Recreate to make even more challenging levels harder than this one, maybe with enemies, blocks, or even scrolling faster than this. Enjoy! :)
Credit to jdaster64 from TSR for the Luigi and Ground Sprites, credit to Wario Bros from mfgg.net for the Luigi Looking Up Sprite, and credit to the user Bobby Alert from Youtube for the World E Classic Super Mario Bros Overworld music.