Thanks to @SuperRey2020 for the sine wave idea! Use the up and down arrow keys to control the wave! This is not pen, i wish it was... Want to know how this works? There is a square that's not invisible, just covered. All lines(the tiny ones) start at the square and dissapear at the red line.All lines (tiny lines) are clones, so the big line you see is made up of clones. I don't need clones to make this, but if I didn't use clones, I would need an extra 44(22*2) sprites.
You could make a Mario Kart track controlled by one player where the other players play! You can make cool patterns with this!