Here is Online Classic Battleships Light Vol 1 is provided by Conceptis Puzzles. One can play more than 30 Battleships puzzles of three different difficulty level using this application. There are many other options e.g. Save, Undo, Redo or checking your solution for errors.
Rules of Battleship Puzzle
Each Battleship puzzle represents an ocean with a hidden fleet of ships, which may be oriented horizontally or vertically within the grid such that no ship touches another, not even diagonally. The numbers on the right and on the bottom of the grid show how many squares in the corresponding row and column are occupied by ship segments. The object is to discover where all ships are located. There is only one unique solution for each puzzle.