"Happy Trucks" is an interesting eye-training logic game in which you have to fill trucks with water to make them happy. Click Play. Imagine that you work in a warehouse. Your task is to fill water trucks with water. But it's not as easy as it might seem at first glance. If the body is half empty or full, the mission will fail. Hold down the left mouse button to pour water from the faucet. You need to guess by eye how much it needs to be poured in order to clearly fill the container evenly. If you did everything right, the next truck will arrive. If you don't guess, try again.