iSink pits you against the computer or against another player using the same iDevice in Head-to-head mode. Each turn grants you five Action Points. These are essentially the amount of ammo you can use by firing a single shot or multiple shots via advanced weaponry. Determine where to target your foe's board and fire away. If an enemy boat is hit, a smoking fiery grid space will result. Take out an entire ship and a neat animated sinking ship will appear under the water surface. Alternating turns continue in this manner until one player dominates the other's fleet.