Quantum Theory

Quantum Theory (クウォンタム セオリー, Kuu~ontamu seorī) is a third-person shooter video game for the PlayStation 3 and Xbox 360. It is developed by Team Tachyon and published by Tecmo. The game was released in September 2010.

The game is a third-person shooter incorporating a cover system. Players can fire their weapon from the hip, aim down the weapon sight for precision, or blindfire from cover. Enemies explode upon death and a successful headshot is rewarded by a slow motion close up view of the head exploding. Syd can throw Filena as a projectile weapon. Syd can use his guns as melee weapons. Syd's initial melee attack can also result in a follow up attack by Filena. Some levels feature environments that can change dynamically, including moving platforms that Syd must hang on to or jump off. Bosses make appearances throughout the campaign, requiring the player to identify and target their weak points.

Story
Set in an organic sci-fi world, years have passed since a world war left the world in a catastrophic state, leaving only a few survivors. In a new community "Cocoon", life has been threatened by a black material called Erosion, creating a post-apocalyptic environment. Surviving humans form a militia to conquer the Erosion and set out to take down the "Living Tower". The main character, Syd, intends to destroy the Tower. He meets Filena along the way, as they both ascend to the top in their search for answers. The tower is constantly eroding, and intensifies as the game progresses.