Battleship

Each side hides a fleet of five ships — lengths 5, 4, 3, 3 and 2 — on a 10×10 grid. Ships never touch each other. Take turns firing one shot at the enemy grid: a hit shows orange, a sunk ship turns dark red, and a miss leaves a small marker. Sink the whole enemy fleet first to win.

The computer's aim depends on the difficulty: random shots on Easy, hunting around hits on Medium, and a probability map of every place the remaining ships could be on Hard and Expert.

1. Press Shuffle my fleet until you like your layout, then Start battle.
2. Tap a square in the enemy waters to fire.
3. The computer fires back after each shot.
4. Sink all five enemy ships to win.

• Search on a checkerboard pattern — every ship covers at least two squares, so you can skip half the grid at first.
• After a hit, test the four neighbours, then follow the line.
• Ships never touch, so squares around a sunk ship are always empty.