You could add a few twists to the rules of battleships as optional extras for your players to enable:
1. After each hit, players would have the option of either moving their battleships one grid square, or rotate it 90 degrees
2. Make each battleship's ammunition limited
3. Add a vertical dimension to your game, have one layer for the water surface and one layer for submarines underwater

Please let me know if I can help with suggestions on how to implement the above features.
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