SUDOKU VERY HARD PUZZLES Volume 4: 400 Sudoku Puzzles - Very Hard Level Sudoku, Sudoku puzzles, Sudoku puzzle books, Sudoku hard, Sudoku very hard, Sudoku hard to extreme, sudoku hard puzzles, sudoku hard puzzle books, Sudoku variants, Sudoku for kids SUDOKU VERY HARD PUZZLES Volume 4 - 400 Sudoku Puzzles Very Hard Level Do you like solving Sudoku Puzzles? This book is for you! SUDOKU VERY HARD PUZZLES Volume 4 - 400 Sudoku Puzzles Very Hard Level is the fourth in Sudoku Very Hard Puzzles Book Series by A. D. Ardson. This book contains 400 brand new, challenging Sudoku very hard puzzles for experienced Sudoku puzzlers. Features: - 400 Sudoku puzzles very hard difficulty level - Full solution to each puzzle at the end of the book If you are looking for a brain workout challenge and if you are a skilled puzzler, these Sudoku puzzles will enhance your concentration and it will generate a lot of fun! "I often lose myself in the Sudoku-like challenges of making a book work." David Mitchell "My secret vice is Sudoku puzzles. Can't stop playing them. My parents are accountants. I blame them entirely." Lisa Gardner "Okay," I said, hoping I sounded confident, like taking the life force out of ghouls was one of my favorite hobbies, right up there with knitting and sudoku." Rachel Hawkins "I can't travel without Sudoku." Robert Ballard "My wife thinks she's better than me at puzzles. I haven't given in on that one yet." Bill Gates