Rampart combines elements of strategy and shoot-'em-up action, with players building their castle from Tetris-style pieces, placing cannons, and bombarding the enemy. The goal is to repair the damage done to your castle while defending it against the opposing forces. The game features single-player and two-player modes in its original arcade release, with later revisions adding three-player gameplay.
Gameplay involves using the castle's artillery to destroy the enemy's defenses while also repairing any damage to your own structure. Players must strategically use their cannons and Tetris-style pieces to outmaneuver their opponents and emerge victorious. The game requires a combination of short-term and long-term planning, making it a challenging and engaging experience.