Sonic Hill Climb Racing 2 Boom is one of the most addictive and entertaining physics-based driving games ever made! Meet sonic, the young aspiring uphill Moto Racer. He is about to embark on a journey that takes him to where no driver has ever been before. From Ragnarok and the Nuclear Plant, all places are a racing track. With little respect to the laws of physics, sonic will not rest until he has conquered the highest hills up on the moon!