SECTOR-9

SECTOR-9 is a browser-based co-op first-person shooter. Drop in solo or grab a friend for split-screen local co-op and hold the line against waves of AI soldiers.

No install, no plugins — runs straight in your browser tab.

Features

• 2-player split-screen co-op — fight side-by-side against AI on one screen
• 5 weapons — pistol, SMG, shotgun, assault rifle, and a scoped sniper rifle, each with its own feel and sound
• Grenades & melee — throwable frags with real arc physics, plus a close-quarters melee strike
• 4 combat zones — Urban Warzone, Indoor Facility, Desert Outpost, and Snow Compound
• Boss waves — a heavy-armor unit shows up every 5th wave
• Downed & revive system — go down instead of dying outright; your squadmate can revive you
• 3 difficulty settings — Easy, Normal, Hard
• Fully synthesized audio — no sound files, everything is generated live, so it loads instantly

Controls

Player 1 (host, keyboard + mouse): WASD to move, mouse to look, click to fire, right-click to aim, R to reload, 1–5 to switch weapons, G for grenade, V to melee, F to revive.

Player 2 (keyboard only, arrow-key side): Arrow keys to move/turn, Numpad 1–5 to switch weapons, Right Ctrl to fire, Right Alt to aim, ] for grenade, \ to melee, ; to revive.

Since browsers only allow one mouse-lock at a time, Player 2 aims by turning rather than mouse-look — a deliberate trade-off to make same-keyboard co-op possible without a second physical setup.

Best played on desktop. Not optimized for mobile or touch.