conway's the game of life, designed to be displayed on a directly driven led matrix.  programmed to work with two buttons (A6 and A7) with A5 free to arbitrarily seed random().  A7 is the reset button if pressed for less than 700 ms / will cycle through the preset configurations if held for longer than 700 ms.  A6 is the next button if pressed for less than 700 ms / will toggle an automatic timed next every set interval if pressed for greater than 700 ms.