Space to change slides, wait a few seconds after pressing the flag or it will start on slide 2 :) Click "see inside" to see further explanation. I hope this is helpful to you in some way :)
Making your own blocks can be very useful when coding large animations/games as it means you don't have to write the same code out multiple times. The animation at the end is not supposed to be good, I am just demonstrating how custom blocks work ;)
