Playing logic puzzle on a daily basis helps to keep an active mind and players often see improvements in their overall concentration.This Variety Logic Puzzles book is packed with the following features: - 500 Hard Logic Puzzles (Sudoku, Kakuro, Hitori, Minesweeper, Masyu, Suguru, Binary Puzzle, Slitherlink, Futoshiki, Fillomino).- 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)