One of the most distinctive two-player online games we've ever featured on our website is Pet Trainer Duel. Pets must be controlled by players while they travel in this extremely casual runner game. For instance, the game starts with two obese cats, and your goal is to restore their health. To do that, engage in weight-loss-friendly activities like taking cold showers, climbing stairs, drinking water, etc. The winner is the individual who weighs the least. Don't consume or do anything that makes you fat.