This is a basic system of pseudo 3D scrolling. This is created to develop a project with this system. Jerrydog was realized with the same system and it was referenced but this will be more flexible because I rewrite it more simple and reusable. Tutorials haven't been created yet, but you can see some hints. At first, look at '_Initialize' block and the global variables starting with 'BG'.
Using the knowledge when having created G-14 Great Fighter Jerrydog and made it more simple. All materials and program were written by G14-Jerrydog. G-14 Great Fighter Jerrydog is here. https://scratch.mit.edu/projects/1042567369/