After both players have secretly arranged their fleet, and the starting party has been chosen, they take turns shooting at the opponent's grid by clicking an unmarked cell.
If an object is hit, the cell is marked red. Otherwise, it's a miss, marked white, which also applies to Mines and Garbage Patches.
As soon as all its parts have been hit, an enemy object is considered destroyed.
The game is won, if the opponent has no ships, submarines, or bunkers left.
Submarine By clicking an allied submarine, a control panel pops up on the opposing grid (at the corresponding coordinate), offering arrows to select the direction of a torpedo launch. A fired torpedo will travel straight-line until it either hits an obstacle or detonates at the grid border. Afterwards, its route is marked white automatically. Clicking the Sonar symbol performs a ping, which uncovers object positions by tagging them.
Mine(neutral) Hitting a mine makes it explode, damaging a 3×3 area on the own grid. There's no chain reactions; a mine hit by a mine will become inoperable, thus be removed from the grid.
Garbage Patch(neutral) Traditional unsinkable, non-flammable, floating Pacific plastic waste. Doesn't vanish if hit, and is marked white only temporarily, if at all.
Bunker As Coastal Battery (3 units) they can only be placed at the border. Not triggering sonar echoes, but casting sonar shadows. In combat, they allow artillery shots, which will destroy a hit object immediately (except Garbage Patches). To activate artillery, a player can click on the shot counter (top left corner) before firing.