In Fortress Defense, players are tasked with safeguarding a stronghold against waves of incoming attackers. The game requires strategic placement of defensive units and careful consideration of each wave's composition.
The core mechanic revolves around managing a limited number of defensive resources, which must be allocated among various units with distinct abilities and weaknesses. Players must balance offense and defense to protect their stronghold while also countering the enemy's strategy.
The objective of the game is to survive as long as possible against increasingly formidable opponents. As the game runs in the browser without download or registration, players can jump in and out of matches at will, testing their mettle against others in real-time.