This simulator models a self-contained artificial-life ecosystem: digital organisms with an inherited genome of speed, size and sense radius forage for food in a bounded 3D arena, spend energy on movement and metabolism, reproduce with mutated offspring once well-fed, and die when they run out of energy. Nothing about the population's traits is scripted — the average speed and efficiency you see emerge purely from which genomes survive long enough to reproduce under the mutation rate, resource abundance and metabolic pressure you set, the same three levers (variation, resources, selection pressure) that drive natural selection in real biological populations.