Math Puzzles For Adults: CalcuDoku Puzzles - 200 Math Puzzles with Answers: 5 (Math and Logic Puzzles)

Tricky Logic Puzzles for Adults: 130+ Difficult Puzzles to Challenge Your Brain

Math Squares for Adults: 100 mental arithmetic puzzles in two difficulty levels

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)

Sudoku : Over 200 Puzzles