Fisher-Diver is an underwater action game with upgrades. Dive into the water and earn as much money as you can by killing fish with your harpoon. Keep an eye your oxygen bar, which decreases when you're underwater and each time that you shoot your spear. Return to the ocean's surface to refill your oxygen bar. When you're satisfied with your day, return to your boat and press space bar to go home. After each day, you can purchase equipment that will allow you to reach greater depths and fish more effectively.