All that you Have to do is push the green flag only once,watch and listen. I works faster on Windows and sometimes on Macs. watch and listen. I made this for the science night at my school.
I made it by messing around with the pen and color effect blocks, and happened to make this. you will probably see other projects that look just like this, such as "Gloom." If I can get at least 25 Stars or Loves, I can make more. Also, be sure to check out my other projects, (Bottom left hand corner) and my studio, The Ultimate Gamers. Thanks!