Two players team up in a survival mode or last stand mode. In survival one of you mans the ballista, whilst the other acts as a hero. Last stand mode sees both of you in acting the hero against endless waves of enemies.
Two opposing castles (the player's and the enemy's) combat one other. Each side has a collapsible castle and fortifications and an army that attacks the opposing castle. While the specific objective varies from level to level, destruction of the enemy's castle and troops via the projectile launcher is the primary gameplay mechanic.
The game challenges both dexterity and mind. The player must have a steady but quick hand to fire accurate shots at a fast pace. The player must decide when it is appropriate to use different ammo types to best accomplish goals. The player must also prioritize short and long-term goals within the current level, with the need to play offensively or defensively changing from moment to moment. Since each level has its own structure and goals, strategic gameplay remains varied and challenging.