This is not a game- just watch the balls make cool patterns on the stage, and press the up and down arrows to change the pen's thickness. Move the slider at the top to change the balls' angle and speed. Press SPACE to erase everything. The possibilities are endless! EPILEPSY WARNING if you put project to max pen size and turbo mode!
I got most of the script from the book, Coding Projects in Scratch. P.S: To make the pattern in the thumbnail, set angle to 65 and speed to 2, then press and hold the UP key, wait for a few secs, and the press and hold the DOWN key.