BioShock

In 1960, a plane crashes in the Atlantic Ocean with man Jack as the only survivor. He finds himself in front of a door to an underwater complex and enters it, discovering the city of Rapture, a supposed paradise built by Andrew Ryan in the 1940s. As he learns about Rapture's destiny, survival becomes his main goal amidst the horrors of free will.

The plot is largely revealed through recorded messages left by Rapture's inhabitants before they died or were mutated. The player must reconstruct the past, using limited stealth and hacking abilities to progress. Character customization and character upgrades are also key gameplay elements.

At its core, BioShock is more action-oriented than System Shock 2, with a focus on combat and plasmid usage. Enemies include Splicers, mutated citizens of Rapture, and the player must use firearms and plasmids to defeat them. Combat tactics rely on successive weapon and plasmid usage.

The player can equip only a limited number of active and passive plasmids, with inventory limits for items. Restoring and enhancing items can be found or purchased, and hacking is presented as a mini-game similar to Pipe Mania.

Plasmids are mostly purchased using ADAM, a mutagen obtained from "Little Sisters" - young girls accompanied by genetically enhanced humans called Big Daddies. The player must choose whether to kill or spare the Little Sister, influencing the game's story and ending.

The Playstation 3 version adds a harder difficulty level called "Survivor Mode" to the game.