The objective is to add ships to the grid, subject to the following rules:
- All given ships on the in the key must be included in the grid with no others.
- No ship may touch another, even diagonally.
- Clue cells cannot be shaded and indicate the number of consecutive cells shaded around them. There must be at least one unshaded cell between shaded regions. ? is wild and can stand for any non-zero value.
A standard 10x10 battleship tapa and its solution.