Quantum Theory (video game)

Quantum Theory is a third-person shooter video game developed by Team Ninja and published by Tecmo Koei. It was released in 2010 for the PlayStation 3. The game is set in a post-apocalyptic world ravaged by a mysterious substance called "Living Erosion."

The story follows Syd, a soldier tasked with eliminating a source of the Living Erosion, and Filena, a mysterious woman who possesses the power to control it. They must cooperate to navigate the decaying tower and defeat the forces within.

Gameplay in Quantum Theory primarily revolves around third-person shooting with cover mechanics. Players control Syd and can issue commands to Filena, who acts as an AI partner. Filena can perform support actions, such as creating temporary shields or enhancing Syd's attacks. A key gameplay mechanic involves the changing environment within the tower, requiring players to adapt their strategies as the levels dynamically transform. Syd has access to various weapons and melee combat options, and Filena's abilities can be used to exploit enemy weaknesses.

The game features a campaign mode that can be played solo or cooperatively online. It also includes competitive multiplayer modes where players can engage in team-based battles. Critical reception of Quantum Theory was generally mixed, with reviewers often citing technical issues, uninspired gameplay, and a derivative narrative.