Bonnier Books Ltd
 
130+ puzzles all in pocket-sized format 
Stay Smart for Brain Health: 175 Quick Exercises and Puzzles to Keep Your Mind Sharp
Sudoku
Sherlock Holmes Puzzles: Code Breakers: Over 100 Challenging Cross-Fitness Brain Exercises
Pocket Posh Sixy Sudoku Hard: 200 6x6 Puzzles with a Twist
Crosswords