Killzone 3 is the fourth game in the Killzone franchise. Several improvements have been made over its prequel, and it can be seen in overall smoother and more balanced gameplay. As in previous game, you will commandeer various turrets and vehicles which will add to firepower but will leave you with rails-driven gameplay. One of the new weapons is a jet-pack which lets you jump and semi-fly with unlimited ammo as a part of new exoskeleton. The environment can sometimes be destroyed or used to your advantage, shooting barrels or certain plants will take out nearby enemy soldiers. Beside single-player campaign, Killzone 3 offers an upgraded version of Killzone 2's multiplayer. The game is also the first in the franchise to support 3D TVs.

Visari is gone, but the war is far from over. Helghast forces have mounted a devastating counter-attack, prompting the ISA evacuation of planet Helghan. As new Helghast battalions with more powerful weapons appear, the ISA find themselves outmanned, outgunned and surrounded. The player reassumes the role of Sev, a surviving member of the Special Forces unit Alpha Squad, who must fight against vindictive, merciless enemy forces in a desperate attempt to escape Helghan alive.