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simple events, simple variables, expert physics, basic math, visibility, resize actor, simple loops, direction and turning, advanced costume handling, conditional wait, simple motion, advanced math, simple conditionals, delays, simple sound playing, layers, detect conditions, advanced animation, advanced motion, screen bounds, simple drawing, simple messaging, expert math, advanced events, functions, miscellaneous, simple costume handling, pen size, pen color, actor properties, cloning, advanced physics, basic physics, advanced messaging,