Click on screen to activate (bring to life) cells. When you're happy with your selection, press space to cycle life! Some cells will die (marked red), and others will born (green), depending upon how many neighbours they have. How many cycles will your pattern survive until the screen is blank? You can add or remove cells at any time clicking with the mouse.
Based on Conway's Game of Life. http://en.wikipedia.org/wiki/Conway's_Game_of_Life (read the article for good ideas for patterns) There are others versions done in Scratch. Mine put stress on interaction and control of each cycle, instead of automatic and fast advance.
