Quantum Theory is a PlayStation 3 action-adventure game from Koei Tecmo. It follows Syd, a lone warrior fighting through a dark, monstrous tower in a wasted world.
- Cleaned, tested, and guaranteed to play. The disc play surface is in nice condition.
- Original online services for this game or platform have been discontinued; any offline or local modes still work normally.
- Third-person action gameplay centers on battles inside hostile environments that change shape during combat.
- Two-character combo actions pair Syd with a partner character for coordinated attacks.
- The setting focuses on a massive living tower and a ruined world overrun by monstrous threats.
- Trophy support is included for PlayStation 3 progression tracking.
Developed by Team Tachyon, Quantum Theory blends cover-based shooting and sci-fi horror imagery with a tower-climbing campaign structure.
