Serious Sam HD is not your mother’s generic, large-scale, orchestral scored, Space Marine-themed epic FPS with dialogue that pretends it’s an RPG...instead, Serious Sam HD is a grab you by the jibblies run and gun, twitch FPS: BIG guns, TONS of enemies, 4-Player Online Co-Op and stunningly superfluous HD graphics that rival retail boxed games. You've waited forever but Serious Sam is back from the nether with its award-winning game play that will remind you why you play FPSs in the first place.