Call of Duty: Black Ops 4 (stylized as Call of Duty: Black Ops IIII) is a multiplayer first-person shooter video game developed by Treyarch and published by Activision. It was released worldwide on October 12, 2018, for Microsoft Windows, PlayStation 4 and Xbox One. It is a sequel to the 2015 game Call of Duty: Black Ops III and is the fifth entry in the Black Ops subseries as well as the 15th main installment in the Call of Duty series overall. Black Ops 4 is the first Call of Duty title without a traditional single-player campaign mode. Instead, it features the Solo Missions mode, which focuses on the backstories of the game's multiplayer characters, known as "Specialists". The missions take place between Black Ops II and III chronologically. Some of the Specialists also carried over from Black Ops III. The multiplayer mode is the first in the series to not feature automatic health regeneration and introduces both predictive recoil and a new ballistics system. The game includes three Zombies maps on release day, four if a special edition of the game, or the Black Ops Pass, is purchased. The locations of the maps include the RMS Titanic, an arena in Ancient Rome, and Alcatraz Federal Penitentiary. The game also introduces a battle royale mode called Blackout, which features up to 100 players in each match. Many characters from this and other Black Ops titles can be used as the player's character model in this mode.
Black Ops 4's multiplayer features the return of Specialists, unique soldier characters with special abilities and traits. The game features a total of ten Specialists, six of which (Ruin, Prophet, Battery, Seraph, Nomad, Firebreak) are returning characters from Black Ops III, while the other four (Recon, Ajax, Torque, Crash) are new additions. It will also feature remakes of five fan-favorite maps, Jungle, Slums, Summit, Firing Range and Nuketown. Treyarch stated that the maps will be available to all players at launch except Nuketown which will arrive in November. Multiplayer has also been reworked with various changes for more tactical and teamwork gameplay. Automatic health regeneration is removed in favor of a manual healing system (with each player having a health bar), weapons are now given predictive recoil patterns, and a mixed ballistics system, using both hitscan and projectile damage, is employed as opposed to just hitscan. Weapon customization is also emphasized, allowing for deeper personalization of players' arsenals; attachments are also given tiers, with tier-2 upgrades providing even bigger improvements to the weapons. Certain weapons also offer Operator Mods, which significantly change how a weapon works, while costing a significant portion of the 10 customization slots per class.
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Zombies returns as the cooperative multiplayer mode for Black Ops 4. The game mode features a wider range of customization, allowing for more personalized play styles. Mechanics of the game can be customized via "Custom Mutations", which include over 100 variables, such as overall difficulty, zombie speed, health, damage, and more. Time-limited events known as "Callings" are also promised to be included in the game for long-term engagement. Similar to the Nazi Zombies mode in Call of Duty: WWII, custom loadouts are included to allow players to select different starting weapons, equipment and special upgradable weapons, as well as perk selection to be available in each match. A new game type, Rush, is introduced into Zombies, where the players build up points and multipliers and compete against one another for the highest point possible until death.