Rampart is an arcade game, released in 1990 by Atari Games, that combines the shoot 'em up and puzzle genres.

In Rampart, the player is in control of a set of castles, which they must defend, by alternately shooting at attacking ships (or other players), and repairing any damage done to them within a time limit. Surrounding this castle is a wall, made up of small blocks, completely surrounding a region of the board. This area is considered the player's territory, and it may contain one or more castles, and any number of cannons. The maintenance of this territory is the primary focus of the game. Once the player defeats the opponent, the player can execute the commander, by walking the plank or beheading.

Gameplay:

The single-player game consists of six levels. The ultimate aim is to destroy a fleet of attacking ships while repairing any damage the fort sustains.

At the start of each level, the player chooses the location of their fort from a number of options. This location is then surrounded by a wall to form a castle, which the player can then place cannons within. After this, an attacking round commences, followed by a repair round, where any damage to the castle must be repaired. If the player manages to survive the repair phase (by surrounding at least one castle within a time limit), he is given a short amount of time to place additional cannons within the walls of his fort (if he made room for them), after which the battle resumes.

This cycle continues until either the player fails a repair round, or enough ships in the enemy's fleet are sunk. When the opposing navy has been sufficiently depleted, the level is won, and the player may then choose another level from the island map.
Place Cannons

After starting a new game or after a successful repair round, the player may gain extra cannons (the number depending on the number of castles captured) to be placed in their territory.

In the SNES and PC versions only, the cannons gained can also be converted into powerups: The Balloon floats at the beginning of phase 1 to the most powerful enemy ship (for singleplayer) or cannon (for multiplayer) and converts it to the player side for the successive fighting round. The Supercannon is bigger than the usual cannons and fire red projectiles, which sink any ship in one hit or leave a permanent fire if they hit the landscape.

Source:  Wikipedia

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