BioShock 2 is a first-person shooter video game developed by 2K Marin for Microsoft Windows, PlayStation 3 and Xbox 360. The sequel to the 2007 video game BioShock, it was released worldwide on February 9, 2010. The Mac OS X version of the game was released by Feral Interactive on March 30, 2012.
The game is set in the fictional underwater dystopia of Rapture. The game opens with a cutscene set in 1958 then jumps 10 years to when Delta wakes up in 1968, eight years after the events of the first BioShock. The protagonist and player-controlled character is an Alpha series of Big Daddy, a being that has been mentally conditioned to protect Little Sisters which is amongst the first of its kind. The player-controlled character Big Daddy, named Subject Delta who was previously paired with a single Little Sister, reactivates with no recollection of the past decade's events and scours the city in an attempt to relocate the Little Sister that he was paired with. Fearing this reunion will ruin her plans for the city, Sofia Lamb, the antagonist, sends out her spliced up followers that she calls "The Rapture Family" and new Big Sisters in an attempt to deter Delta.
In 2010, the game was included as one of the titles in the book 1001 Video Games You Must Play Before You Die.
BioShock 2 is presented as a survival horror first-person shooter, with the player taking on the role of Subject Delta, a prototype for the Big Daddies approximately 8 years after the events of the first game. As with BioShock, the player explores Rapture and fights off Splicers, the remaining psychotic human population of the post apocalyptic underwater city of Rapture, using a combination of the environment, weapons, Plasmids and Tonics. Plasmids and Tonics are special genetic-reencoding liquids that grant the user active or passive abilities respectively, and includes both those introduced in BioShock and new ones for this game. For example, Plasmids can give the player the ability to use telekinesis or evoke fire, while Tonics can improve the player's movement speed, attack damage, or damage resistance. Several of the weapons in BioShock 2 are those that were previously seen carried by Big Daddies in the first game, including a powerful drill and a rivet gun. The player can use each weapon in a close-range melee attack, unlike in the first game. The player is able to equip both a weapon and a Plasmid at the same time, which they can use in quick succession to destroy enemies. For example, by first freezing a foe then shattering it into pieces using a spear gun. If the player is killed, they are revived in the nearest "Vita-Chamber".
As the player explores Rapture, they will collect ammo, health, recovery items, money and EVE (a liquid used to power Plasmid use). Money can be used to purchase more items at vending machines across the city. The player will also encounter security systems which can be hacked through a mini-game, this requires the player to stop a quick-moving needle one or more times in the correctly-colored marked area of a gauge. Stopping it within the green area progresses the sequence and or potentially ends it while stopping in the blue area may grant a bonus to the hacking attempt, landing in a white area shocks the player (dealing a small amount of damage) and landing in red-colored areas can lead to the start of a security alert. The player also gains access to a research video camera. In BioShock 2 once the player begins recording an enemy, the player has a short time to damage that enemy in creative ways in order to score a number of points, which are then added towards the total research of that enemy type. At various levels of research, the player is then rewarded with new abilities in general or towards that specific type of foe. Certain areas of the game take place entirely underwater, limiting the actions the player can perform.