Sector Command: Perimeter

Every wave calls for a new plan. Build your defenses, combine specialized towers, and hold the perimeter against swarms, shields, and heavy armor. You decide when the next wave begins. Sector Command: Perimeter is sci-fi tower defense on a clear neon grid. Pick your build sites, upgrade your towers, and adapt between waves. No ads. No subscription. START PLAYING FOR FREE Unlock six campaign maps with Endless mode: Sector Alpha, Neon Cross, Relay Spur, Spiral Rift, Expanse Reach, and Filter Gate. Basic, Sniper, Laser, Flame, Flak, and Corrosive towers become available through campaign progress. Choose Easy, Medium, or Hard and chase each map's high scores, stars, and side objectives. COUNTER EVERY THREAT Splash damage for swarms, energy for shields, flak for airborne enemies: your tower choices matter. Upgrade your towers and choose specializations. Clear blocked build sites and cover several routes on multipath maps. Brood Carriers release extra swarms when destroyed, while bosses put your defenses to the test. REINFORCE YOUR BASE From Spiral Rift onward, spend run gold on a base module in campaign runs. Choose more income between waves, an extra repair, or an emergency shield. One module per run: will you invest in your base or your next tower? READ THE WAVE. TIME YOUR RESPONSE. Directives change enemy composition, pace, or gold. Campaign directives are fixed, so you can plan your defense around them. Equip tactical modules and time your Slow Pulse, Minefield, or Shield Strip. Unlock additional modules and an extra loadout slot as you progress. HOW LONG CAN YOU HOLD? Win a campaign map to unlock its Endless mode. From wave 21, base doctrines give your tower combinations new strengths: five pairs, two options per pair, and up to two doctrines per run. New combinations include Basic/Sniper and Corrosive/Laser. Optional Endless+ adds a visible seed, a choice between two directives, and separate high scores. Same seed, same choices: try a better strategy on your next run. Endless+ requires a separate purchase or the corresponding bundle, plus a Hard victory on that map. PROGRESS THAT STAYS WITH YOU Earn credits through your performance and invest in economy, base, and combat upgrades. Additional maps and the Rail, Cryo, EMP, and Missile specialty towers are available in the optional content pack or bundled with Endless+ as one-time purchases. Meta upgrades use credits earned by playing. For iPhone, iPad, and Mac. The refreshed HUD and adapted menus keep your defenses in view, even on smaller screens.