All actions are performed through the left mouse click.
Holding down the mouse click allows one to choose the strength of the proceeding attack, and depending on where the mouse stands at the time of projectile release, the projectile's landing area will be determined. (additional information below)
There are three fortress types available to choose from, each of which is represented by the three thriving nations of the Avatar World: the Water Tribe, Earth Kingdom, and Fire Nation.
Once one of these fortresses has been selected, the game chooses one of four locations that will become the battlefield. Each of these fields has specific advantages and disadvantages that affect both fortresses.
Each building that is a part of the fortress has a unique ability that is capable of turning the tide of any battle; however, as that structure is worn away by the bombardment of an enemy fortress, its functionality decreases until, once totally destroyed, it is no longer of any use. A list of the structures (excluding the main fortress building) and their abilities is as follows:
Armory — Creates weapons to use against the enemy fortress.
Bending tower — Increases the speed at which bending power regenerates.
At the end of each succeeding battle in single-player mode, a screen will appear that allows the player to spend gold pieces that his or her character has acquired through the course of the game, on the repair of the fortress' exterior and the replenishment of weapon supplies.
Every time a player executes an attack, the image of that nation's most prominent character appearing in Book One: Water of Avatar: The Last Airbender is shown. That character will glow when the fortress launches the chosen attack. Players who choose a Fire Nation fortress are represented by Zuko; those with a Water Tribe fortress by Katara; and those with an Earth Kingdom fortress by Aang.