
The nearby 203rd Cadian Regiment of the Imperial Guard is also redirected to Graia. Multiple options are considered, and since the world is considered too valuable for Exterminatus yet a full military fleet would not arrive in time, it is decided to deploy Space Marines – huge, heavily armored super-soldiers enhanced with genetic therapy, new organs and such – of the Ultramarines Chapter to secure the Titans while a liberation fleet makes its way there. The game opens with a computer screen discussing the course of action to take regarding Graia, an Imperial Forge World constructing Titan war machines and now under alien invasion. Additional objectives appear randomly, awarding on-the-fly bonuses if completed. To get through each mission the players must survive to activate a key part of each arena, triggering a sequence that grants access to the next.

Four players jump into an arena and face off against waves of enemies until they defeat all the waves or die trying.Įxterminatus has two missions to play, each comprised of multiple arenas, which in turn break down into several waves. Space Marine will feature a co-operative four-player arena mode called "Exterminatus", to be added as free DLC in October 2011.

The player controls a single character, Captain Titus of the Ultramarines 2nd Company, through a plot involving an Ork invasion of an Imperial Forge World and later a Chaos invasion on top of it. Space Marine includes a linear single-player campaign estimated at around 12–15 hours of playing time.
