Most unblocked versions have a similar layout:

To be fair, this isn't a game for everyone.

Once you hit "Start," you are just an observer. This is where the game shines as a zen experience. Watching cells battle for survival is oddly soothing. It appeals to the same part of the brain that likes watching sand fall in an hourglass or water boil. It is a "fidget spinner" for the intellectually curious.