Each player secretly places 5 ships on a 10×10 grid: Carrier (5), Battleship (4), Cruiser (3), Submarine (3), and Destroyer (2). Ships can be placed horizontally or vertically. Click to place, right-click to rotate. Players alternate calling out grid coordinates to fire shots. A hit is marked in red, a miss in white. When all cells of a ship are hit, it sinks — and its full outline is revealed. Sink all five enemy ships to win. A placement timer (90 seconds) starts at the beginning. Any unplaced ships are auto-placed randomly when time runs out.