Black Fortress: Idle Defense

Command a flying fortress above a dark industrial world. Let your defenses fight, collect salvage, and decide when to leave the safety of Anchorage for an expedition.

BUILD YOUR ARSENAL
Research 72 blueprints across 12 technology lines. Fit kinetic cannons, rotary batteries, piercing rail lances, flak screens, homing missiles, plasma mortars, arc coils, and cryogenic projectors. Improve your shields, foundry, precision targeting, and expedition recovery.

PUSH YOUR LUCK
Take on daily and weekly expeditions with three combat stages. Secure loot at extraction beacons, collect consumable superweapons, and decide whether to push deeper or return safely. Emergency warp protects your fortress and banked loot when your hull falls.

KEEP THE FOUNDRY RUNNING
Collect offline salvage when you return, with research extending storage from 24 to 72 hours. Enjoy an atmospheric three-track soundtrack with a sound toggle.

Optional rewarded ads can grant a superweapon charge, repair your shields at a beacon, or double an offline salvage claim. Interstitial ads may appear after expeditions. You can keep playing when ads are unavailable.

Progress is stored on your device. No game account is required.