This is an advanced project that demonstrates how to make a scrolling background.
input/output, delays, basic math, simple loops, simple variables, visibility, resize actor, simple messaging, simple events, simple conditionals, functions, advanced motion, simple motion, advanced costume handling, simple costume handling, simple sound playing, direction and turning, detect conditions, cloning, text handling, music and instruments, program control, screen bounds, advanced events, conditional loops, miscellaneous, advanced loops, graphic effects, simple drawing, layers, advanced math,