Select the pattern number then press the green flag. Turbo mode(Shift + Green Flag) There are 4 patterns The 4th one creates a bunch of Sierpinski Triangles
Thanks to @Scratch-Minion for the condition for the third pattern https://en.wikipedia.org/wiki/Chaos_game https://en.wikipedia.org/wiki/Iterated_function_system Uses a simple method where it generates random points based on the position of the preset vertices.