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Enjoy hours and hours of puzzle-solving fun with this BIG book of 500 Number Fill-In puzzles with OPTIONAL starter clues. Sometimes you want or need help and sometimes you don't. The gray box is the key here! Each puzzle comes with an optional starter number so YOU decide whether you have help starting the puzzle or not. If you want or need some help to get things going, a clue is provided for you! But if you prefer more of a challenge, the optional starter clue will not be in your way. 500 puzzles for hours of brain-stimulating fun! Optional clues so YOU decide your level of challenge Two puzzles per page with dozens of numbers to find Improves cognitive ability and deductive reasoning Perfect gift for puzzlers of any age or skill level Quality paper for a better puzzle solving experience Give your brain some gentle exercise while you figure out which number goes where. Keep an eraser handy in case you need it, and allow yourself the occasional peek at the answers in the back of the book if you get stuck. Printed on quality paper so sharp pencils or gentle erasing won't easily tear the page. Great fun for the whole family!