From the back of the box:
Attack & defend to sink the enemy fleet!
Find and sink your opponent's ships before they sink yours. Use shields to protect your fleet and special Power cards to improve your strategy.
This is the "lite" version of the game Battleship: Card Game distributed by Wm Morrison Supermarkets PLC consisting of 50 cards for 2 players including the promotional and instruction cards.
Cards are played in a 3 x 3 grid rather than a 3 x 4 grid, and players have 3 destruction cards rather than 5.
Overview:
Each player shuffles and places their Coordinate cards face down in a grid. They then draw cards from their Destruction Card deck. Players take turns playing one card. The first player to eliminate all of their opponent's ships wins!