You play by moving your mouse around the screen so your pony can move. The aim is to not get the yellow ball to touch the line.
Credit for cakeland11. She was the one who convinced me to code on Scratch. Please check out my friends channels, cakeland11, issystreet, mythicalwombats1, chloecorner, peppertreegrove, thechooksclub, jellytop and if you go on their profile picture you will find more.