Galaxies is a puzzle where you have to fill an entire grid with galaxies. You only have the centers of the galaxies as clues and expand these so that they take up all available space on the grid. The tricky part is that all galaxies have to be "spirals". In other words, if you rotate a galaxy 180 degrees it should look exactly the same as it did before the rotation. Similar to a Tetris game piece. This book contains 200 Hard 15x15 puzzles, 4 per page. We are sure you will find these puzzles offer an entertaining yet effective way to exercise your brain and keep your mind sharp. All puzzles have been checked to ensure there is only one valid answer. Find more pencil puzzle books on Brainy's website www.BrainysLogicPuzzles.com