Activity Book : Logic Puzzles for Adults & Seniors: 500 Medium Puzzles (Sudoku - Fillomino - Straights - Futoshiki - Binary - Slitherlink - Sudoku X - ... 28 (Brain Games for Adults Series)

Activity Book: Logic Puzzles for Adults & Seniors: 500 Medium Puzzles (Sudoku - Fillomino - Straights - Futoshiki - Binary - Slitherlink - Sudoku X - Masyu - Minesweeper): 28 (Brain Games for Adults)

Logic Puzzles & Brain Games for Adults: 500 Easy to Hard Puzzles & 12 Puzzle Types (Sudoku, Fillomino, Battleships, Calcudoku, Binary Puzzle, ... Numbrix): 4 (Challenging Fun Brain Teasers)

Medium Logic Puzzles & Brain Games for Adults: 500 Puzzles & 12 Puzzle Types (Sudoku, Fillomino, Battleships, Calcudoku, Binary Puzzle, Slitherlink, ... and Numbrix) (Challenging Fun Brain Teasers)