Genetically enhanced action-adventure, survival horror first-person shooter by 2K Boston/2K Australia (previously Irrational Games) that lets you do things never before possible in the genre. Turn everything into a weapon, biologically mod your body with plasmids, hack devices and systems, upgrade your weapons and craft new ammo variants, and experiment with different battle techniques. It also contains some mature content.
The game is based on exploring the dystopia of an isolated underwater city called Rapture in 1960 and surviving the mutated beings and mechanical drones within it. The architecture and society of Rapture was strongly inspired by the works of Ayn Rand, especially Atlas Shrugged, while the game itself is described by the developers as a "spiritual successor" to their previous PC title System Shock 2.