Mortar Beacons are featured on the Corinth Highway, Pyrrhus Crater, Bilgarsk Boulevard, Frozen Dam, and Mawlr Graveyard maps.

In the climax of Killzone 2, Emperor Scolar Visari is assassinated by ISA forces, triggering a full-scale attack by the Helghan First Army.

Overwhelmed, ISA commanders order a full withdrawal, leaving thousands of their own soldiers to die on Helghan.

With the Helghast now driven to seek revenge for Visari's death, the survivors must join forces to find a way home.

With Helghan cruisers preparing to attack their fleet, they are forced to fight their way through the ruins of Pyrrhus, sacrificing most of their remaining armor and manpower in order to reach an extraction point near the edge of the city.

Six months later, Stahl calls for a vote in the Helghan Imperial Senate to remove Orlock for incompetence, but his request is denied.

Furious, Stahl ends his company's cooperation with the First Army and organizes his personal guard to hunt down the ISA, who have set up a base in a remote jungle near one of their destroyed cruisers.

While working to restore the base's communication uplink, the soldiers learn that the UCN has agreed to a ceasefire with the Helghast, effectively abandoning them.

Learning that Stahl plans to publicly execute Narville, Tomas and Rico don Helghast uniforms and rescue him and his fellow prisoners.

Believing himself to be Visari's rightful successor, Stahl intends to win the favor of Helghan by conquering Earth itself.

The ISA comes under attack from a massive Helghan assault mech, and though they manage to defeat it, their numbers are reduced to just 60 men.

Aware of Orlock's plans to murder him after securing his weapons, Stahl double-crosses and kills him before launching an attack on the First Army, giving the ISA a desperately needed opening to steal several Helghast transports.

A direct nuclear strike ordered by Narville obliterates the vessel, causing it to drop its Petrusite arsenal on Helghan.

President of Sony Computer Entertainment America, Jack Tretton, confirmed its development in an interview with GameTrailers, but at that point of time could not yet say when the game would be announced.

In addition, Guerrilla Games hired an external writer to focus on only writing the storyline so as to give a fresh perspective to the story as well as hiring a lot more Hollywood actors to elevate the level of storytelling within the dialogue of the game (such as Malcolm McDowell voicing Jorhan Stahl and Ray Winstone voicing Admiral Orlock).

The Killzone 3 3D mode is optional and requires a 3D ready TV[34] The first impressions of the 3D showed some glitches; with three-dimensional visual effects, the game became blurry, imprecise, and disorienting.

7-Eleven offered downloadable content for Killzone 3 in exchange for Slurpee purchases in stores in the U.S. which ran from February 2011 to the end of March 2011.

Players who purchase Killzone 3 Multiplayer are also granted a 24-hour double XP bonus, three unlock points, the ability to set up clans and custom games, and access to the Botzone mode, as well as the addition of four exclusive trophies.

Second place runners-up received a copy of Killzone 3, ACID Music Studio software, and Ten Loop Libraries.

[57] The download packs contained in the Super Voucher (excluding the soundtrack) were also available as pre-order bonuses for the Standard Edition of Killzone 3 from select retailers in North America.

Best Buy offered the "Fast Starter Pack" which contained a voucher allowing players to rank up faster as they earn double XP for the first 24 hours of multiplayer gameplay.

[59] There was a mini-game in the Central Plaza called "Killzone Plaza Defender" which was a Killzone-themed first-person shooter mini-game where players shoot down enemy Helghast airships, ground vehicles, and infantry units or assist gunners by collecting and delivering ammunition, repair kits, and first aid.

Completing all of the challenges for all three waves granted three Unlock Points, which could be redeemed for new weapons and abilities in the Killzone 3 multiplayer.

[60] On November 15, 2011, in the PlayStation 3 game Uncharted 3: Drake's Deception, a DLC pack was released titled "Multiplayer Accessory Pack #1 (Killzone)" which includes the "Capture Trooper Skin", a "Helghast Helmet" and an "ISA Helmet", which can also be purchased individually (free for "Fortune Hunter's Club" members).

[62] The map pack was also available as a pre-order bonus from various retailers and could be obtained from 7-Eleven's promotion of Killzone 3 for 10 Slurpee rewards points.

Edge and Schick are offering specially packaged shaving gel and razors for three PS3 exclusives; Gran Turismo 5, Infamous 2, and Killzone 3.

The special Killzone 3 packages include a redeemable voucher for the Retro Map Pack or three Unlock Points.

The review stated "on a visual level, as a 3D breakthrough, this feels like a watershed moment in a revolution affecting all of gaming".

Destructoid gave the game a perfect 10/10, with reviewer James Stephanie Sterling stating: "I don't think the PlayStation 3 has ever had quite such a rounded, satisfactory package as this, with this level of polish, refinement and pure, simple, unpretentious action".

Earlier in the week Edge reported that one of Sony's studios had stopped PlayStation 3 development and moved onto its successor.