Most puzzles start off with a few of the ship piece locations revealed to you, as shown in the above game picture as the pieces with red dots on them. This way there is always enough information displayed at the start of each puzzle to logically deduce the location of all the hidden ships. Ships are positioned either vertically or horizontally in the ocean grid and no two ships can occupy adjacent squares, even diagonally. Once you positively identify the location of a ship piece, then you can block off the water squares surrounding it. The numbers along the side of and below the grid indicate the number of grid squares in the corresponding rows and columns that are occupied by vessel pieces. Every puzzle has a unique solution that can be determined by reasoning alone. Recon Deluxe comes complete with over 1,500,000 different puzzles. Recon Deluxe includes 6 levels of difficulty and 3 variations (oceans). • Atlantic: Normal puzzles just like above • Pacific: All four subs (single-piece ships)  are shown to start you off • Arctic: Mostly water shots are revealed to start you off