Bumper Noughts & Crosses: 300 Puzzles Each Offering an Exciting Challenge

Bumper Noughts & Crosses

Welcome to this brand-new book, containing a whopping 300 noughts and crosses puzzles. The puzzles are divided into four levels of difficulty: - Easy puzzles: played on 6x6 grids - Medium puzzles: played on 8x8 grids - Hard puzzles: played on 10x10 grids and featuring the uniqueness rule - Very hard puzzles: played on 12x12 grids and featuring the uniqueness rule All the puzzles in this book require you to place the same number of Xs and Os in each row and column of the grid: in the 8x8 puzzles that means four noughts and four crosses in each row and column, and so forth. The same symbol cannot appear in more than two consecutive squares: thus XOX, XXO, OXX are all valid, but OOO and XXX would not be. The hard and very hard puzzles require an additional uniqueness rule making them trickier to solve: in the finished grid no complete row or complete column can repeat: for instance if one complete row contains 0X0X0X0X0X then no other row in the puzzle can contain exactly the same ten-digit sequence. Similarly if a column contained 0X0X0X0X0X then no other column could contain that same sequence. All solutions are included at the back of the book so you can check your answers easily as you go along. And every puzzle can be solved with logical rules alone - no guessing is ever required to solve any of our noughts and crosses puzzles. Good luck and happy solving!