-PLEASE READ EVERYTHING BEFORE PLAYING- Use the arrow keys to move, and space to jump. Sorry if you are used to WASD. Mario is buffed very critically, and you'll see what I mean. To go into the castle, go to the edge of the screen instead of in the doorway. Some Goombas can't be jumped/stomped on, but they can't kill you either. Only the moving ones can. There is only one specific way to kill/defeat Bowser, and it isn't jumping/stomping on him like you do to (most of) the Goombas. Also ,please notify me of any glitches in the comment section below. Good luck and enjoy!
Thank you @S65 for making the original project! The links are below.