Goal: sink the enemy's fleet before they sink yours.

Setup: place 5 ships of different sizes on your grid by tapping each cell where the ship should go. Cells must be in a straight line — all in a row or all in a column — and connected to each other. Once you've tapped enough cells for a ship, it's placed and you move on to the next.

Play: on each turn, click a cell on the enemy grid to fire. A red ✕ means you hit a ship. A white dot means you missed. The enemy fires back automatically. The first to sink all 5 of the opponent's ships wins.

Fleet: Carrier (5), Sea Battle (4), Cruiser (3), Submarine (3), Destroyer (2).