Counter Terrorism Defense is a free tower defense game available on Android, centered around the theme of anti-terrorism. Players engage in strategic shooting gameplay, focusing on defeating terrorists who have taken over city buildings. The game challenges players to break through enemy defenses by selecting various defenders, each with unique abilities, to secure victory.

The mechanics of Counter Terrorism Defense emphasize tactical decision-making and resource management. Players must strategically position their defenders to effectively counter the terrorist threat, utilizing different weapons and defenses to navigate through increasingly difficult levels. This engaging puzzle-like approach to tower defense offers an immersive experience for fans of the genre.