Super Mario Bros scrolling background with moving and jumping Mario plus turtle and mushroom movement. Use the arrow keys to scroll. Note that you may need to restart a couple of times to see the Mario and other characters - there seems to be a bug in the layering. Also, the mushroom movement isn't quite right in the browser, but it's fine within Scratch itself. The trick to getting a good scrolling background like this is: 1) Use 480x360 sprites as your background images. 2) Since Scratch can't move them all the way off the screen, use two "border" sprites to make the screen narrow enough. 3) Offset the background image positions to overlay each other by the border width (18 pixels). 4) Layer the images. 5) Use a variable for all sprites to control their positions. You'll see that once you set things up with the right size, positions, and the borders, the scripts to handle the scrolls are simple. Handling character movement that occurs off-screen is a bit tougher, with some tricky calculations. Fortunately, most of the math is based on the scrolling background positions.
