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SECTOR ZERO is a self-contained WebGL first-person shooter — no build step, no external engine. Hold a breached concrete bunker alone against escalating assault waves of armored hostiles: aim down sights, manage 30-round mags and reloads, sprint, and spend credits on armor, ammo and weapon upgrades between waves. Desktop uses pointer-lock mouse look; mobile uses a twin-stick scheme with a fire pad that doubles as the aim surface. Finished runs post to a shared online leaderboard, and there's a scripted attract demo before you tap in.