Life is a zero player game. You start the game by selecting 'cells' from a theoretically endless grid. Once you are satisfied with the pattern you have created, press play and let the simple rules of the game evolve the pattern. The limitations are endless, what you create is ultimately up to you.
Rules Of The Game
If the cell is alive, then it stays alive if it has either 2 or 3 live neighbors.
If the cell is dead, then it springs to life only in the case that it has 3 live neighbors.