CORE SIEGE: Bastion-7

Offline, no ads, free. Build turrets and troops, hold off a boss every five waves, and grow permanently with core shards even after defeat. First release on iOS.

Frontier outpost Bastion-7. The swarm sleeping beneath the crust has woken to the core's resonance. Until the evac ship arrives, the core must hold.

CORE SIEGE is a sci-fi wave defense game in which you protect a central core from a swarm attacking from every direction. Drag cards with one hand to build turrets, use abilities to survive the tough moments, and read the pattern of the boss that appears every five waves.

■ Your defenses

• 6 turrets: Pulse, Tesla Coil, Cryo Field, Focus Laser, Missile Battery, Railgun
• Interceptor drones and 4 troop types (Marine, Combat Medic, Sniper, Pyro Grenadier) with a rally point
• Abilities: Orbital Strike, Stasis Field, Emergency Repair, Core Overcharge
• Three upgrade tiers, selling, and weapons that unlock in order as you clear waves

■ Bosses and waves

• A named boss every five waves: Destroyer Alpha, Abyssal Behemoth, Resonance Predator, Mother of the Swarm
• Each boss has its own pattern (charge, submerge, crystal shield, spawning) that calls for a different answer
• Preview the next wave during the prep phase and adjust your layout
• Combo kill bonuses, elite enemies, and a swarm that enrages if a wave drags on

■ Progression and challenges

• Core shards persist through defeat; spend them on permanent upgrades in the Laboratory
• Five sectors (Central Platform, Magma Rift, Infested Outpost, Cryo Sector, Void Fissure), each with its own gimmick
• Three difficulties (Easy, Normal, Hard) and a date-seeded Daily Op
• Ranks (S to D) and ending lines based on the wave you reach, plus best records

■ Good to know

• Works fully offline and collects no personal data
• No in-app purchases and no ads
• Progress is saved on your device
• Korean and English (follows the device language; switchable in Settings)
• A run takes about 5 to 20 minutes