Happy Trucks is a filling puzzle game. Your job is to fill up the trucks with liquid. Do that in all 30 levels. For each level there is a different truck, so you need to estimate how much fluid will fit in that truck. You should not overfill the truck, nor should it be half empty. If you make a mistake in the assessment you will start playing that level again. Very interesting game that you will enjoy playing. Happy Trucks, puzzle game, fluid filling, truck game, 30 levels, hypercasual, kids game, mobile game, brain training, estimation, puzzle challenge, fun game, casual gaming, addictive game, fill the truck, fluid levels