Here it is: the next big puzzle sensation, destined to join sudoku and kakuro as a bestselling blockbuster. Yubotu is the Japanese word for “U-Boat” or submarine, and this collection plays a variation on the traditional favorite known as Battleships. It’s co-created by Peter Gordon and Mike Shenk, the team that first brought this type of puzzle to America. The object is to locate 10 ships in a fleet—four subs, three destroyers, two cruisers, and one battleship—all hidden in an “ocean” represented by the spaces in a grid. An introduction explains all the basics in detail, taking solvers through a sample puzzle, with the puzzles getting more difficult as you go along until they’re absolutely brain-busting!