TSA writes: Quantum League describes itself as a Time-Paradox Shooter. Now, buzzwords often get thrown because they sound cool, not because theyre all that relevant to the actual game, but in Quantum Leagues case its hard to describe it as anything else. Time-Paradox Shooter is the best possible description for what its doing. You see, Quantum League has you fighting through FPS battles across three separate timelines, all of which play out at the same time.

Source: N4G PC Quantum League Review (TheSixthAxis)