You don't need to be a math expert to enjoy a sudoku puzzle -- so sharpen your pencils and get ready for a much needed brain-boost with this engaging collection. More than 100 sudoku puzzles with three levels of difficulty will hone your logical thinking skills. The book's size is perfect for travel or taking on the go. OVER 100 PUZZLES: Keep your brain fit with more than 100 sudoku puzzles for hours of fun and entertainment! UNIQUE CHALLENGES: Designed for the novice, intermediate, to expert these sudoku puzzles will challenge at every level. CONCEALED SPIRAL: Semi-concealed spiral is perfect for throwing in your purse without snagging things in your bag! PERFECT SIZE: Smaller trim size is easily transportable for on-the-go entertainment! Whether you're drinking your morning coffee, riding on the train, or relaxing on vacation this puzzle book can go with you. BRAIN BUSTERS(TM) Part of the Brain Busters Puzzle Collection from Parragon & Cottage Door Press. Look for other books including Large Print Sudoku Puzzles, The Big Book of Sudoku, Bad@ss Mother Puzzler, Smithsonian Natural History Word Search & Women in History Word Search, The Ultimate Book of Mixed Puzzles, John Deere Word Search, Large Print Word Searches, Bible Word Search, Crosswords, Picture Puzzles, and More!