

The game begins with Sam being summoned before the Sirian Great Council, where the Council provides him with guidance on how to accomplish his goal to defeat Mental. Steamworks for online play - It eliminates the need for Gamespy for online play since the service has been announced to be officially closed. The game's story picks up shortly after the end of Serious Sam: The Second Encounter, with Serious Sam continuing his goal to defeat his arch nemesis, Mental.

Co-Op and Deathmatch Chaos - Go to war against Mental’s horde with up to 16 players online and annihilate everything that moves across 45 levels of mayhem or drop the gauntlet and face off in brutal Deathmatch.Helpful Native NPCs - Meet different races inhabiting environments and even fight side by side against enemies, to experience an additional bit of cooperative play feeling within the single player campaign.Powerful Turrets and Crazy Vehicles - Use powerful turrets to wipe out the relentless hordes of enemies and engage in heart-thumping action atop wild, mountable animals and intense, death-dealing vehicles.Also, for the first time ever, use the alternative fire button to lob a grenade into an oncoming crowd of monsters and what the bad guys go boom! Destructive Weapons - Unleash Sam’s classic arsenal with the shotgun, minigun, rocket launcher, and cannon or square off with new guns like the Klodovik.Spectacular Environments - Battle across more than 40 beautiful, expansive levels spread out over 7 unique environments and gain the support of the quirky native tribes.

