Join our Discord to chat with fellow friendly gamers and our knowledgeable contributors!

Not an American user?


It has been 300 years since humanity collapsed in the wake of a great war. Nearly all of civilization destroyed, only small groups continue to live on in the wasteland. However, in the wasteland, there are strange towers that have appeared. Seemingly sentient, nobody knows who built them or why, only that anyone who ventures near will know only death. From these towers comes a mysterious substance called diablosis, which corrupts those who touch it, turning them into murderous killing machines. One man, known only as Syd, has made it his mission to destroy these towers and stop the diablosis.

Quantum Theory is a a cover-based third-person shooter similar to the popular Gears of War series. Syd can hide behind and fire from cover, as well as "roadie run" between cover to move closer to enemies. He can carry up to three different weapons at a time, as well as go face-to-face with a powerful melee attack. Syd will also team up with a woman named Filena, with whom he can perform special team attacks, and even throw her at enemies for an especially powerful attack. In addition to the single-player campaign, there are also online team and deathmatch multiplayer modes.


There are no user screenshots for this game

Promo Images

There are no promo images for this game

Alternate Titles

  • "クウォンタム セオリー" -- Japanese spelling

User Reviews

There are no reviews for this game.

Critic Reviews PlayStation 3 Sep 28, 2010 42 out of 100 42 Xbox 360 Sep 28, 2010 42 out of 100 42
GameSpot Xbox 360 Oct 07, 2010 4 out of 10 40 Xbox 360 Oct 01, 2010 6 out of 20 30 (UK) Xbox 360 Sep 28, 2010 3 out of 10 30 PlayStation 3 Oct 01, 2010 6 out of 20 30
Destructoid Xbox 360 Oct 02, 2010 2.5 out of 10 25
Gaming Nexus PlayStation 3 Oct 28, 2010 D 25
IGN Xbox 360 Oct 06, 2010 2.5 out of 10 25 PlayStation 3 Oct 24, 2010 2 out of 10 20


There are currently no topics for this game.


European version

In the first two levels the blood from Gillskin enemies was coloured cyan, enemies killed with a critical hit don't lose their head and a bloody scene in one cutscene was removed.
Contributed to by 雷堂嬢太朗 -raido.jotaro- (60651)