We like games around here, but we can't always run out and buy new ones, especially ones that might be too hard to play for our age groups. Levi's been longing to play Battleship, so we made our own version.
After the first round, I tweaked it a bit, to make it a bit easier for my 6 year old. There's a red player and a blue player, and the even numbered rows are slightly colored, to help you find your spot on the graph.
Want to play? Download Battleship and print out the two pages. You could totally laminate them and use dry erase markers. Or you could just use a pencil. Each person hides their five ships in their bottom grid (make ships that are 5, 4, 3, 3, and 2 boxes long), and then take turns shooting. You don't have to keep track of where the other person shoots (I only do that because Levi's still learning, and I want to make sure he's getting his shots down correctly).