"Learn to Fly 3" is a popular online game where you play as a penguin trying to fly as far as possible. You must use various tools and upgrades to launch your penguin into the air and keep it flying, all while avoiding obstacles and collecting money to buy more upgrades. As you progress, you can unlock new flight modes and earn achievements. The game is known for its simple yet addictive gameplay and has gained a large following since its release in 2015.