For children aged 7-9, the Bright Sparks series is aimed at sharpening the minds of the next generation of puzzle masters. Number Riddles for Bright Sparks contains more than 80 mind-boggling number games, including arithmetic chains, number pairs, sudoku puzzles, time tests and loads more. The activities gradually get more difficult as the book progresses, letting the reader get to grips with each puzzle style and then build on their skills.