Unholy Alliance: Tower Defense is a strategy game available on Mac that pits players against a variety of enemies from both the earthly and dark realms. Players must defend their Extractors from relentless waves of foes by utilizing a comprehensive selection of towers and special powers. The game offers a rich tactical experience, allowing players to customize their defenses with various upgrades and specializations that enhance gameplay and strategy.

Set in diverse environments such as forests and wastelands, players can adopt different approaches to fend off enemy attacks. Options include deploying towers for direct combat, using Wind to push enemies back, laying Mines to hinder progress, and utilizing Decoys to mislead foes. The ability to freeze enemies adds another layer of strategic depth, making each decision critical in the fight for survival against the Unholy Alliance.