Castle Defense is a fully-featured tower defense game that blends strategic planning with real-time decision making. You must protect your castle from relentless waves of enemies — goblins, zombies, knights, trolls, and fearsome bosses — by building and upgrading a combination of towers across a winding path.

Three tower types give you a tactical toolkit: the Archer tower fires fast and accurately at single targets; the Mage tower slows enemies and deals magic damage; and the Cannon tower unleashes devastating splash damage on clusters. Each can be upgraded twice, dramatically increasing their effectiveness.

Between waves, you earn gold that can be spent on new towers, upgrades, or one of three powerful spells: the Meteor spell damages all enemies simultaneously, the Frost spell freezes the entire field for five seconds, and the Gold Rush spell triples your reward income for ten seconds. Choosing when to spend and when to save is half the game.

Campaign mode features 30 hand-crafted levels, each with a unique winding path and increasing enemy composition. Endless mode pits you against infinite escalating waves on a treacherous path, with your final wave score posted to a global leaderboard. A combo multiplier rewards rapid kills, keeping high-level play exciting.