Defend your Core against endless waves of enemies in a fast-paced tower defense built around strategy, progression, and powerful synergies.

Build your defenses across unique platforms, choose from a wide variety of specialized towers, and upgrade them throughout each run. Every tower has its own role: single-target damage, area attacks, anti-air defense, crowd control, economy, drones, lasers, missiles, lightning and more.

Every 10 waves, open a Perk Booster and choose a new bonus to shape your build. Combine perks, tower upgrades and Core abilities to create increasingly powerful defenses as enemy waves grow larger and tougher.

BUILD YOUR DEFENSE
Place towers strategically on limited spaces and decide where to invest your energy. Upgrade individual towers, improve your economy, and adapt your defenses to each wave.

CHOOSE YOUR CORE
Different Cores offer unique passive bonuses and powerful active abilities. Unlock new Cores by completing achievements and mastering harder challenges.

DOZENS OF UNIQUE LEVELS
Battle across square and hexagonal platforms with different layouts and amounts of building space. Each level requires a different strategy.

4 DIFFICULTY MODES
Progress from Easy to Medium, Hard and Impossible. Complete each difficulty to earn medals and prove your mastery of every level.

ENDLESS SCALING
Finished a level? Keep going in Endless Mode. Enemies continuously increase in number, health and speed, with increasingly dangerous carriers, bosses and anomalies.

BUILD THE PERFECT RUN
Open randomized Perk Boosters, find rare bonuses and chase powerful Legendary perks. No two runs have to develop the same way.

UNLOCK YOUR COLLECTION
Complete challenges to unlock new towers and Cores, then experiment with different combinations and strategies.

CLIMB THE LEADERBOARD
Push as far as possible, maximize your score and compete for a place among the best Core Siege players.

How long can your Core survive?