Use arrow keys to move and jump. Collect the coins. Jump upon Goomba enemies (twice!) to beat them. Also, yes, playing as a Koopa has a few advantages. - When moving, you are just low enough for the Bullet Bills to fly above you. - You get 5 lives, instead of just 3. - You get sick music.
The original was made by PaulKoning, but you probably already saw that. UPDATE LOG: 7-7-19 - Added update log -Added new sound effect for completing level