After picking up a favorable critical reception at the International Games Festival, Audiosurf has been the indie flavor of the month on Steam, and rightly so. Ostensibly it is about veering a hovercraft left and right along a race track that undulates to the beat of your chosen song and collecting colored blocks for points, but the grid that those color blocks fall into turns the game into a kind of two-tiered puzzler. Keen racing reactions are needed to collect and correctly position high-scoring blocks of the same color into groups of 3 or more (after which, as you may have guessed, they will disappear).