Captain!
Enemy warships have been detected in our waters, it is a declaration of war.
We must respond quickly… load the guns, aim … shoot

For young children or not, battleship is a classic logical game.
Choose a box, and fire!
The first to have sunk all the boats of his opponent will win.

Captain, we lost our aircraft carrier…

2 grid sizes 10×10 (classical) and 5×5 (quick game) will allow everybody to play easily.