Mass Effect 3 Multiplayer

Cooperative multiplayer is a game mode that is featured in Mass Effect 3, and marks the debut of multiplayer in the Mass Effect series. In this mode, up to four players can join together online and customize characters to fight on the front lines of the galaxy-wide war against the Reapers, as well as Cerberus, Geth and Collector forces. Progress in co-op earns the player rewards in Mass Effect 3: Galaxy at War that can be used to influence the outcome of Mass Effect 3's single-player mode.

Playing the Mass Effect 3 multiplayer mode requires an Online Pass.

Missions
Missions in cooperative multiplayer consist of pitting the player and up to three other allies against eleven waves of enemies, including Cerberus, Reaper, geth, or Collector (requires Mass Effect 3: Retaliation) troops on various battlefields throughout the galaxy. Players must survive these waves by eliminating the enemy forces, and also accomplish objectives.

All objectives have a time limit, and the mission will end if time expires. There are five types of objectives, occurring randomly at waves three, six, and ten:
 * Devices: Enable or disable four key devices in sequence.
 * Assassination: Take out four targeted enemies in sequence. Time is extended after each kill.
 * Hacking: Capture and hold a point in order to hack critical data before time runs out. Additional players within the hacking zone quicken the process.
 * Retrieval (requires Mass Effect 3: Rebellion Pack): Retrieve two high priority packages and securely transport them to a designated extraction zone on each map. Using sprint, combat rolls, and certain powers (i.e. Biotic Charge, Tactical Cloak, Shadow Strike, or Havoc Strike) causes the player to drop the carried package.
 * Escort (requires Mass Effect 3: Earth): Activate and escort a drone to an extraction zone while it collects data. Additional players within the escort zone quicken the process. The drone itself is invulnerable and will occasionally replenish player shields and attack enemies with missiles or electrical shocks.

On the eleventh wave, all players must defend against the enemy for a set time period, then retreat to the designated extraction zone within the time limit. Though the mission is considered complete after clearing the tenth wave, bonus experience (relative to the amount of players extracted) and bonus credits (if the player survives extraction) are awarded after completing wave eleven.

Missions have four challenge difficulties, in order from easiest to hardest: Bronze, Silver, Gold, and Platinum. Platinum difficulty was added by the Mass Effect 3: Earth DLC pack. Higher difficulties feature stronger and more numerous enemies, as well as difficult enemy types in earlier waves and in larger numbers, but will also reward more credits to spend in the Store.

Mass Effect 3: Galaxy at War
Playing cooperative multiplayer ties into the Mass Effect 3: Galaxy at War system. Participating in matches can quickly increase the player's Galaxy at War Readiness rating, and multiplayer characters who reach the maximum level can be "promoted" into valuable War Assets for the single-player campaign. Co-op and the Galaxy at War system are entirely optional, however, and are not necessary to achieve the optimal endings in single-player, although the process could be considered significantly more difficult.

Completing a multiplayer mission while having a readiness rating of 100% grants a 5% boost in experience earned, shortening the amount of time it would take to promote a multiplayer character to the Galaxy at War.

N7 Ranking
Each multiplayer user has an associated N7 Ranking. The ranking serves as an indicator of players' overall level of experience with the game, and is calculated by adding together the total levels ever gained by each class, plus 10 for each time a class has been promoted.

Character Customization
Players can choose from six different classes and ten different races to create a unique multiplayer character. Characters' weapons and equipment can be customized between matches, and additional weapons and equipment obtained by purchasing packs from the Store. Leveling up and promoting characters directly affects a player's N7 Rank.

Store
The Store sells multiplayer item packs and distributes reward packs from weekend events. Contents of these packs include new weapons, multiplayer characters, experience points, weapons mods, and pieces of equipment, all of which are of varying quality. Credits to purchase packs from the Store are earned through gameplay; alternatively, packs can be purchased with Microsoft Points on Xbox 360, BioWare Points on PC, or currency on PlayStation 3.

Weekend Challenges and Events
Weekend Challenges are held every weekend, and feature objectives that individual squads or players can complete. Successfully completing Weekend Challenges will reward players with Commendation Packs containing unique weapons.

Weekend Events are held periodically during weekends, and feature objectives that the entire community can participate in. Successfully completing Weekend Events will reward players with item packs.

Medals
Depending on how well individual players or the entire squad does, at certain milestones, they will earn medals. The awards are leveled by Bronze, Silver, and Gold with each having their own individual levels.

Individual Medals
Individual Medals are awards earned by each member of the team. They are specific to each character and are not shared with other members of the squad. Each weapon class, in addition to tech and biotic kills, has its own medal for killing enemies with it. There are also medal for assisting other squadmate with kills, reviving downed squadmates, and getting headshots with any weapon.

Individual medals cannot be earned again in the same match. You can only get one of each individual medal per match. The Bronze level of a medal gives +500 exp, the Silver level gives +1000 exp, and the Gold level gives one of two bonuses. You get +1500 exp for weapon kills, and +2000 exp for anything else.

Squad Medals
Medals are earned by the squad for killstreaks, the outcome of the extraction (at least one squad member must be extracted and the outcome depends on the size of the squad), surviving multiple waves consecutively without a single squad member going down, completing an unknown map, the level of the completed map, completing the map with unknown enemies.

Medals for survival and killstreaks are earned regardless of map completion.

Challenges
Challenges are a Multiplayer gameplay mechanic introduced in Mass Effect 3: Retaliation. Completing certain goals will complete a challenge, providing the player with Challenge Points, which serve as measure of their skill. Completing a Gold challenge unlocks a banner and title card to display in the match lobby.

Maps
Multiplayer matches are playable on a variety of different maps. The available maps are:

Standard Enemies

 * Cerberus
 * Assault Trooper
 * Centurion
 * Combat Engineer
 * Nemesis
 * Guardian
 * Phantom
 * Atlas
 * Turret
 * Dragoon


 * Geth
 * Geth Trooper
 * Geth Hunter
 * Geth Rocket Trooper
 * Geth Pyro
 * Geth Prime
 * Combat Drone
 * Geth Turret


 * Reaper
 * Husk
 * Cannibal
 * Marauder
 * Ravager
 * Brute
 * Banshee
 * Swarmer

Retaliation Enemies

 * Cerberus
 * Dragoon


 * Geth
 * Geth Bomber


 * Collector
 * Abomination
 * Collector Captain
 * Collector Trooper
 * Collector Web
 * Possessed Abomination
 * Possessed Captain
 * Possessed Scion
 * Possessed Trooper
 * Praetorian
 * Scion
 * Seeker Plague
 * Seeker Swarm

Resurgence Pack
The Mass Effect 3: Resurgence Pack is a free DLC pack for Mass Effect 3 that added two new multiplayer maps, six new multiplayer characters, three new weapons, and four new consumable items. The pack was released on April 10, 2012 for Xbox 360 and PC, and April 11, 2012 for PlayStation 3.

Rebellion Pack
The Mass Effect 3: Rebellion Pack is a free DLC pack for Mass Effect 3 that added two new multiplayer maps, six new multiplayer characters, three new weapons, a new match objective, and a new equipment slot. The Rebellion Pack was released on May 29, 2012 for all platforms worldwide, and May 30, 2012 for the PlayStation 3 in Europe.

Earth
Mass Effect 3: Earth is a free DLC pack for Mass Effect 3 that added three new multiplayer maps, six new multiplayer characters, three new weapons, five weapon mods, eleven gear upgrades, a new match objective, and a new Platinum difficulty. Earth was released on July 17, 2012 for Xbox 360 and PC worldwide. For the PlayStation 3, the pack was released on July 17, 2012 in North America, and July 18, 2012 in Europe.

Retaliation
Mass Effect 3: Retaliation is a free DLC pack for Mass Effect 3 that added fifteen new enemies, sixteen new playable characters, three new weapons, six Gear bonuses, three ammo bonuses, environmental hazards for six existing maps, and Challenges for players to complete. Retaliation was released on October 9, 2012 for Xbox 360 and PC worldwide. For the PlayStation 3, the pack was released on October 9, 2012 in North America, and October 10, 2012 in Europe.

Bugs

 * 1) Issues had been reported with already unlocked kits, characters, and items becoming locked again, typically after switching kits. This bug was remedied and now it is impossible to buy kits from the store while "ready".
 * 2) Another bug occasionally happened by using Biotic Charge immediately before getting knocked out. It would cause the player to glitch heavily during movement, float several feet above the ground, before getting stuck either right underneath the map or several hundred feet above the ground. This glitch was fixed by Patch 4.
 * 3) It's reported that host migrations can cause bugs with locking too.
 * 4) Sometimes when grabbing enemies, the grab animation will not occur, and the enemy will appear beside you, invincible. Should this occur, it is advisable to avoid that enemy until they die on their own (usually falling through the map).
 * 5) A bug had been reported that the Ultralight Materials upgrade for SMGs did not actually reduce power cooldown times. This bug was incorrectly reported to be fixed in Patch 1.03, and was eventually fixed with the next patch.

Trivia

 * The cancelled first-person shooter game, Mass Effect Team Assault, served as the basis for Mass Effect 3's multiplayer.