From NES Hacker Wiki
Battleship is a board game based on the popular board game. It was developed by the UK division of Mindscape, which was their only NES-developed title.
See the guide on Easy Cheats to find out how to use these.
00F1 - 09 - 8 way shot (must turn on and off in between turns or the comp will have the same shot) You can replace 09 with any number 00-09 for different types of shots the 8 way is the best type though