Biological simulator invites players to control a microorganism in a dangerous environment. The goal is to consume other cells and reach a mass of one hundred units to win. Controls use the mouse or screen taps to guide the creature through the space. Players must avoid white antibodies that neutralize the character upon collision. Consuming smaller organisms increases size and brings you closer to completing the objective. Defeat by immune cells requires continuing evolution with current progress retained. Try to survive in the hostile environment and become the dominant organism in this game.