Populate the map using the RANDOM button or choose one of the preset boards. You can also add individual points by clicking on them. Step moves ahead one generation, Run performs generation automatically.
This is based on Conway's Game of Life. There are at least 2 dozen implementations of this in Scratch. So here's yet another. I like to think it's one of the better ones :-) By the way here's my favorite one. http://scratch.mit.edu/projects/17166649/
