Use the left and right arrows to move the ball. Use the up arrow to jump. Remix to add scoring opportunities, obstacles, scene changes, sound, debug any errors you find, and more!
You might also want to check out my video tutorial for scrolling backgrounds on the official Scratch YouTube channel (look for the Advanced Topics: User-Controlled Scrolling Background video) and find a link to written resources related to this topic in the video description. Take a look at another version of this in my and "Scrolling Background Advanced - Platformer" project, "Scrolling Background Advanced - Walking" project, and "Scrolling Background Advanced - Top Down" project.