Sudoku Challenge: 200 fiendish Sudoku puzzles with a twist: Volume 4

Do you love sudoku? Do you want to test your skills with a unique maths and logic game? If you do, then you will love this collection of over 200 puzzles ideal for you to do anytime, anywhere. 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 . U nique , fun, and interactive this collection of brain-teasing puzzles , can be played offline and will keep you entertained for hours and hours. Whether you are looking for puzzle practice to train your brain , or seeking a screen-free offline alternative to online puzzles, or a sudoku challenge like no other this collection will have you enthralled.