Halo 3 is a first-person shooter developed by Bungie and published by Microsoft Game Studios. It concludes the original Halo trilogy, following Master Chief as he battles the Covenant and the Flood to end the intergalactic war. The game features cinematic storytelling, large-scale campaign missions, competitive multiplayer modes, and cooperative gameplay. With refined mechanics, iconic weapons, and expansive maps, Halo 3 remains one of the most celebrated sci-fi shooters available on PC.