Wacky, cartoon-style books that help you improve your mental agility...flex those brain cells! Have a go at solving these puzzles all based around numbers and sequences. Use your maths skills and powers of deduction to work out the answers. Fun and rewarding number-based problem-solving books that encourage and develop lateral and systematic thinking skills. Four books in the series are aimed at KS2 maths students aged 8-11, or for kids that just can't get enough of puzzles.