Another Battleboat Idea: Loop Battleboat (Also can be Loop Battleboat Plus, Dark loop Battleboats, etc...)
Overview - if you can hit your opponenets ship with the correct amount of shots without missing, you don't give it time to "sink" and you capture it! You can then place it back into play as one of your own ships!
Details: Sink ship with correct # of hits = let say you make a hit, if you can finish hitting the rest of the ship without any "miss" shots - you capture it. So a 4 ship will take 4 shots from the first one that hit. (If you miss with one of them, the boat has more time to take on water and sinks - not letting you capture it.)
Place back on board: Not one can you place it back on the board, you can also place it in an area that your opponent already shot! (So instead of "hit marks" on the board, you will have a "1", "2", "3", "4", etc.... that way you you can tell when you last tried to shot in an area easier.