Sudoku Challenge: 200 fiendish Sudoku puzzles with a twist (Paperback)
In Sudoku Challenge, you fill in the puzzles with the usual rules, but when the grid is complete, you then use the clue numbers to work out how to calculate the challenge number.
Unique, fun, and interactive this collection of brain-teasing puzzles, can be played offline and will keep you entertained for hours and hours.
Roland Hall has worked as a Commissioning Editor of puzzle books for a number of years. He was responsible for book publishing with many best-selling puzzle brands, including Mensa, The Puzzler and Take A Break, and devised a number of highly popular themed puzzle books and packs on subjects as diverse as Sherlock Holmes, Star Trek, Pride and Prejudice and Dante's Inferno. He has written and contributed to many quiz and puzzle books, including Anagram Challenge, and Wordle Challenge for Kids.