Quantum Theory (クウォンタム セオリー, Kuuontamu Seorī) is a third-person shooter video game developed by Team Tachyon and published by Tecmo Koei for the PlayStation 3 and Xbox 360.

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.

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 story then flashes forward to where Syd and other soldiers fight through destroyed city streets against the Diablosis as they make their way into the "living tower".

During this time he was part of a squad of exiled Gilskins, the leader carrying the Revenant weapon Syd now uses.

The entire squad is wiped out during a battle with Diablosis, only Syd survives, now using the leader's Revenant.

[7] GameZone gave it four out of ten, saying that the game "looks and feels like an anime-inspired fan mod of Gears of War 1.

While I'm a devout supporter of doing things right the first time, I wouldn't mind seeing a sequel that steps up its game, makes better use of Filena, and learns from the critical feedback the original received (which is nearly insurmountable at this point).