Peaceful Mind Sudoku: Easy Puzzles to Relax and Unwind

SUDOKU Puzzles Relax & Focus: Easy to Relax, Unwind Keep Your Mind Sharp

Sudoku Zen: Evening Calm - 200 Easy Puzzles to Unwind and Relax

Sudoku for Relaxation: 60 Easy Puzzles to Unwind and Train Your Mind

Easy Sudoku for Relaxation: Simple Puzzles to Sharpen Your Mind and Unwind