This project shows how a smooth scrolling effect can be achieved with just a single sprite, script and, in my case at least, a single variable. Navigate the ocean using the left and right arrow keys. Note that the background can be as big as you want it to be, you just need to make more costumes for the extra peices. Here's another example of a different type of scrolling background: http://scratch.mit.edu/projects/24389783/
If you would like to see more scratch projects like this one go to my studio - http://scratch.mit.edu/studios/477650/ And also check out some of my different projects @theonlygusti In my projects I want to explain and utilise simple, helpful mechanics that would be useful for other scratchers in their projects. I also aim to make my projects as simple and easy to implement as possible, so I work on cutting down the number and lengths of scripts required for functionality (I add a few extra scripts in my demonstration projects).