The critters all evolve to get the most food, an accurate simulator of real-life evolution Each critter has it's own 4 digit DNA strand to determine how it turns and moves. The ones with the best DNA for finding food create 1-5 critters with the same DNA. Each new critter has a 1 in 3 chance of a having a minor mutation Watch out! It tends to lag around generation 6. (if they get there)