This Variety Logic Puzzles book is packed with the following features: - 500 Hard Logic Puzzles (48 Suguru, 48 Futoshiki, 36 Arrows, 32 Mathrax, 48 Hakyuu, 36 Straights, 48 Fillomino, 40 Sudoku, 48 Sutoreto, 36 Skyscrapers, 48 Creek and 32 Shikaku).- Answers to every puzzle are provided.- Each puzzle is guaranteed to have only one solution.Includes free bonus puzzles you can download book (Tons of Sudoku Puzzles for Adults & Seniors) Includes free bonus puzzles you can download book (Word Search With Hidden Message: 102 Puzzles for Adults and Seniors) ***Completing logic puzzle regularly helps the brain process both problem solving and improves logical thought process with the use of deductive reasoning, which can also be applied to approaching real life challenges in a different manner.Playing logic puzzle on a daily basis helps to keep an active mind and players often see improvements in their overall concentration.***