What can you say about this classic old pencil 'n paper to Game Boy Color creation? It's... erm... Battleships, really. Each player has a grid where our water-based ships (an aircraft carrier, battleship, destroyer and submarine) are placed. Your opponent doesn't know where you plonked yours and vice versa.
By taking one turn at a time, you've got to guess where the enemy ships are - simple, eh? The trick is to try to find the trickier small craft, of which there are two. The tension builds as you get that whistle-y bomb noise, then the dreaded message that you've missed. It's really satisfying when you mae a hit, and the game converts perfectly onto the handheld format.
With the added bonus of special items (be it a four square radar or tipple missiles), you'll be shouting "You sank my battleship!" for hours to come. Hit, miss or maybe... it's a hit!