Use the arrow keys right, left, and up to move. You can change your jump height by holding them for a specific amount of time. If Mario doesn't show up he's on a coffee break, you may need to click that green flag again. If Mario looks like he is sinking in quicksand, press jump till he is out
Credits to Freepik for clouds and bush pixel art Mario, Goomba, and BulletBill are done by me on Piskel a free pixel art-making platform. Check out my other games including my new platformer, Red.