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Gameplay
As opposed to earlier games in the Call of Duty series, the game features modernequipment and new features, many exclusive to the multiplayer part of the game,
such as "killstreaks"; killing a number of enemies without the player dying in
between kills allows access to various assets including airstrikes and helicopter
support. A character can be positioned in one of three stances: standing, crouching,
or prone; each affecting the character's rate of movement, accuracy, and stealth.
Using cover helps the player avoid enemy fire or recover health after taking significant
damage. As such, there are no armor or health power ups. When the character has taken
damage, the edges of the screen glow red and the character's heartbeat increases.
If the character stays out of fire, the character can recover. When the character
is within the blast radius of a live grenade, a marker indicates the direction of the
grenade, helping the player to either flee or toss it back to the enemy.
Campaign
The player takes on the role of various characters during a single-player campaign.
The characters' involvement in the plot occurs simultaneously and overlaps the events
in the game. As such, the player's perspective changes from one character to another
between missions. Each mission features a series of objectives; the player is
led to each objective with the heads up display, which marks its direction and
distance. Some objectives require that the player arrives at a checkpoint, while
other objectives require the player to eliminate enemies in a specified location,
stand their ground to defend an objective, or plant explosive charges on an enemy
installation. After the credits, a special epilogue mission is unlocked for play,
featuring a four-man squad retrieving a VIP from terrorists who have hijacked an
airliner. The SAS rescue the VIP and escape before the plane is destroyed.
Multiplayer
Call of Duty 4 features team-based and deathmatch-based multiplayer modes on various maps.
Each mode has an objective that requires unique strategies to complete.[4] Players
can call in UAV reconnaissance scans, air strikes, and attack helicopters, when they
achieve three-, five-, and seven-enemy kill streaks respectively.[3] A game ends when
either a team or player has reached a predefined number of points, or the allotted
time expires in which case the team or player with the most points wins. If the points
are even when the time expires, Sudden Death mode is activated in which there is no
re-spawning and the team who either has the last man standing, or achieves the objectiv
first are the winners. If the player is in either of the two matches, then there is
an Overtime match, in which the next team to win is rewarded the victory.[4]
The player's performance in the multiplayer mode is tracked with experience points,
which can be earned by killing opposing players, completing challenges, completing
objectives, or by completing a round or match. As the player gains experience, they
advance in level, unlocking new weapons, perks, challenges, and gameplay modes. The
highest obtainable level is 55, but on the console versions of the game, the player has
the option to enter "Prestige" mode, which returns their level to one and removes all accumulated unlockables.
This process can be repeated up to 10 times with a different insignia being given each time.[5]
Completing a challenge grants experience points and may unlock weapon attachments. As a player's
level increases by gaining experience points within online games, it unlocks new weapons, perks,
or challenges. As the player advances in levels, they earn the ability to customize their classes;
this includes selecting their main weapon, side arm and special grenade type. Additionally,
the player can select 3 perks, one from each of the three "Tiers", that can customize their
character further. Perk effects include, but are not limited to, extra ammunition, increasing bullet
damage by the player, or dropping a live grenade when the player is killed. The player is also given the
choice to complete challenges in order to receive even more experience points; challenges include
achieving a certain number of kills with a specific weapon, shooting down a helicopter or performing a
number of head shots. Additionally, when the player attains a certain amount of headshots with a specific
weapon, excluding sidearms, the player unlocks extra weapon "camos", or camouflage,
to use for that specific weapon.[3]
Synopsis
Characters
Main article: List of characters in Call of Duty 4: Modern Warfare
During the single player campaign, the player controls six different characters from a
first-person perspective. The player assumes the role of recent British Special Air
Service recruit Sgt. John "Soap" MacTavish for most of the game, starting with his enrollment
in the 22nd SAS Regiment.[6] Sgt. Paul Jackson is part of USMC 1st Force Recon deployed to
the Middle East, and the player controls Jackson's character during five levels of Act 1.
Cpt./Lt. John Price (voiced by actor Billy Murray) is an SAS officer who is playable in two
flashback missions from 1996. Yasir Al-Fulani is the president of the unnamed Middle Eastern
country in the game, and is playable only in the game's opening credit sequence before he is
executed. The player also assumes the role of an American thermal-imaging TV operator aboard
an AC-130 gunship during one level, and a British SAS counter-terrorist operative infiltrating
a hijacked airliner to save a VIP in the "Mile High Club" level.
The game's non-playable characters (NPCs) feature prominently in the story: Captain John Price
(in his NPC capacity) and his right-hand man, Gaz (voiced by Craig Fairbrass), serve as mentors to Soap.
Jackson's USMC platoon is led by Lt. Vasquez (voiced by David Sobolov) and Staff Sergeant Griggs
(voiced by and modeled after Infinity Ward lead animator Mark Grigsby); Griggs later accompanies
MacTavish in Russia. Sergeant Kamarov leads the Russian Loyalists that ally with the SAS and USMC
forces. "Nikolai" is a Russian informant who helps the SAS. Captain MacMillan is Price's mentor and
commanding officer during the flashback to the assassination attempt on Zakhaev.
The antagonists in the story are: Imran Zakhaev, the leader of the Russian Ultranationalist party
and the main antagonist of the game; Khaled Al-Asad, the commander of the revolutionary forces in
the Middle East and an ally of Imran Zakhaev; and Victor Zakhaev, the son of Imran Zakhaev and a
priority figure in the Ultranationalist party.
Plot
The game starts with Sgt. John "Soap" MacTavish arriving for his
first day with the British SAS at a training camp in Credenhill, Herefordshire in the UK.
There, he trains for a cargo ship raid in the CQB, or "Killing House". During the actual mission,
located in the Bering Sea, Soap, Captain Price, Gaz, and several SAS members attempt to find a
nuclear device on board. As they clear the ship of the hostile crew, the ship is fired on by Russian MiGs
and begins to sink. The team escapes with the cargo manifest, which provides evidence of ties between
the Russian Ultranationalist Party and a rebel faction in the Middle East.
Russian Ultranationalist leader Imran Zakhaev, who plans to return his motherland to the times
of the Soviet Union, draws international attention away from his plans by funding a coup d'état
in an unnamed Middle Eastern country, organized by a local separatist leader named Khaled
Al-Asad. Discovering the plot, the American government starts a police action to stop the
uprising, while the SAS continues to operate in Russia. After President Al-Fulani of the Middle
Eastern country is executed on live TV and Al-Asad takes control, the SAS rescue their compromised
informant, Nikolai, from Ultranationalist forces.
During the American invasion of the Middle Eastern country, a platoon from the USMC
1st Force Recon, led by Lt. Vasquez, searches for Al-Asad but are too late and only
secure a television station broadcasting Al-Asad's plan. They then proceed to aid other
American units who are fighting a battle against the separatists. During the final stages of the
operation, United States Central Command learns of Al-Asad's position in the capital but is also
notified by SEAL Team Six of a Russian nuclear weapon nearby and sends the Nuclear Emergency Support
Team to disarm it. Meanwhile Vazquez's squad stays behind to rescue the pilot of a downed AH-1 Cobra
that was providing them with fire support. Despite being able to save the pilot, the nuclear device
suddenly detonates, leveling most of the city, killing most of the US invasion force. Jackson's squad's
helicopter is caught in the blast, killing everyone on board.
The British then learn that Al-Asad fled the country before the American invasion and is hiding in a
safe house in Azerbaijan. With the help of Nikolai's intel and assistance from Loyalist Russian soldiers,
the SAS clear the village of the Ultranationalist forces, then capture and interrogate Al-Asad at his
safehouse. Shortly into the interrogation, Al-Asad's phone begins to ring. After hearing the voice of
the person calling Al-Asad's phone, Captain Price executes Al-Asad, now knowing that Zakhaev is Al-Asad's
backer. Price then tells the story of a mission to eliminate Zakhaev in Pripyat, Ukraine, 15 years earlier.
In the aftermath of the Chernobyl disaster and the collapse of the Soviet Union, Zakhaev took advantage of
the turmoil to profit from nuclear proliferation, and used his new wealth to lure soldiers from the Red Army
to form his Ultranationalist Party. In 1996, Price was paired with Captain MacMillan, a Scottish SAS captain,
to carry out a black op assassination of Zakhaev. After sneaking into Pripyat and hiding in an abandoned hotel,
Price shot Zakhaev with a Barrett M82 sniper rifle, but Zakhaev survived, losing his left arm. MacMillan was
injured by a crashing helicopter after he and Price shot it down. Price then carried MacMillian to the exfil point,
defending it from attack by Ultranationalist soldiers until the evac helicopter arrived.
Back in the present day, a joint operation is conducted by Price's SAS unit, a USMC Force Recon unit led by SSgt.
Griggs, and Loyalist Russian forces led by Sgt. Kamarov, to stop Zakhaev. They attempt to capture his son Victor in
an unnamed Russian city, to learn of Zakhaev's whereabouts, but as they corner him on the roof of an apartment
building, Victor commits suicide to avoid being captured. Zakhaev becomes enraged, blaming Western nations for the
death of his son, and plans to retaliate by launching ICBMs armed with nuclear warheads at the East Coast of the United
States, with predicted losses of over 41 million people. When the operatives arrive at the facility in Russia, Zakhaev
manages to launch ICBMs towards the United States. However, the squad successfully seizes the silo command room and remote
detonates the missiles over the Atlantic. They then escape the facility in military trucks with Zakhaev's forces in hot
pursuit.
Before the squad can escape across a nearby bridge it is destroyed by an Mi-24 leaving
them trapped. Zakhaev's forces arrive and engage the remaining members of the strike force.
Gaz receives a call from Kamarov informing him that his forces are on their way to help. On
bridge a gas tanker behind them explodes, incapacitating everyone, except Griggs, who is killed while
trying to pull Soap to safety. Zakhaev, along with two of his soldiers, walks through the squad executing them,
killing Gaz and several others. Before he reaches Soap and Price, however, he is distracted by the destruction
of his gunship and the arrival of the Loyalist helicopters. As Zakhaev fires at the Loyalist helos,
Price slides his M1911 pistol to Soap, who shoots and kills Zakhaev and his two guards. When Sgt. Kamarov
and his team arrive Soap is evacuated to safety, while a Russian medic attempts to resuscitate Price.
Call of Duty 4 was developed by a team of a hundred people, over the course of two years.
After Call of Duty 2, the Infinity Ward team decided to move away from the World War II
environment of previous games in the series. This resulted in two game concepts: Call of Duty 4:
Modern Warfare and Call of Duty: Modern Warfare 2. While developing the story for Call of Duty 4,
Infinity Ward chose to avoid referencing current, real-life wars, and keep the series' common theme
of two opposing forces of similar strength. To enhance the realistic feel of the game, the
development team attended a live-fire exercise at Marine Corps Air Ground Combat Center Twentynine
Palms, a training facility in the California desert. This helped the developers to simulate the effects
of being near an Abrams tank when it fires. The team also talked with United States Marines who were
recently in combat to get a feel for the background, emotions, and attitude of Marines in combat.
Veterans were also recruited to supervise motion capture sessions and the artificial intelligence
design of the game.
The development team designed the online multiplayer component to be balanced and rewarding for new
players while still offering something for experienced players. An early idea to implement air support
(air strikes and attack helicopters) involved players fighting over special zones to access a trigger
for air support against enemies. This idea was discarded because it discouraged the type of deathmatch
gameplay they intended. The kill streak reward system was put in its place to encourage the improvement
of player skills. Players were allowed to select weapons before matches to get accustomed to weapons more
easily and minimize weapon hunting. Maps were designed primarily for deathmatch games—the developers felt
such designs suited other types of gameplay as well. Map layouts were designed to minimize locations players
could hide from enemy gunfire.
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Audio
Most of the music for Call of Duty 4: Modern Warfare was written by British composer Stephen Barton,
who had also contributed to film scores by Harry Gregson-Williams. Gregson-Williams also composed
music for the game, such as the main theme. Several music tracks from the game are available on
Infinity Ward's "7 Days of Modern Warfare" website, and some are available at Barton's own web
site.The rap song played during the end credits is performed by Call of Duty 4's lead animator,
Mark Grigsby.
Game engine
Call of Duty 4: Modern Warfare runs on the IW engine, specifically IW 3.0, featuring
true world-dynamic lighting, HDR lighting effects, dynamic shadows and depth of field.
Bullet penetration is calculated by the engine, taking into account factors such as surface
type and entity thickness. The game runs in
a native resolution of 600p on the Xbox 360 and PS3.
Certain objects, such as cars and some buildings, are destructible. This makes distinguishing
cover from concealment important, as the protection provided by objects such as wooden fences
and thin walls do not completely protect players from harm. Bullet stopping power is decreased
after penetrating an object, and the decrease is dependent on the thickness and surface type of the object.
The game makes use of a dynamic physics engine, not implemented in previous Call of Duty titles. Death animations
are a combination of pre-set animations and ragdoll physics. Console versions of Call of Duty
Modern Warfare run at a consistent 60 frames per second, and the Wii version runs at 30 frames per
second.Code was included to determine spawning points based on the nearby weapons and the
relationship between enemy positions and line of sight to the points. The various criteria are
meant to minimize players dying immediately after rejoining a match, or being "spawn-killed" due
to players simply waiting for others to However, enemies may still respawn infinitely,
a notable feature in Call of Duty game engines.
The game engine has also been used for the development of two other Activision games. An enhanced version
of the original engine was used in Call of Duty: World at War, the fifth installment in the Call of Duty
series after Call of Duty 4, while a slightly altered version has been used for the James Bond video
game Quantum of Solace as well as GoldenEye 007 using a heavily modified version.
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