Gears of War is a third-person shooter built around a cover system, where players duck behind obstacles and use tactical fire to advance on enemies. The signature weapon is an assault rifle fitted with a chainsaw bayonet, and a timed reload mechanic can grant a brief damage bonus or jam the gun if mistimed. The five-act campaign can be played solo or in two-player co-op, and a competitive multiplayer mode supports up to eight players split between the two factions. It was the first game in the Gears of War series and helped popularize the modern cover-based shooter, later receiving remastered versions.