Author(s): Federation of Children's Book Groups
In this title, more than 100 fiendish puzzles divided into four sections: mental, word, number and memory challenges. Each brainteaser has a time limit, usually between 30 seconds and three minutes - at the end of every challenge, the child ticks a 'You did it!' box or a 'Not this time' box. Answers are at the end of the book, along with a scoring table that allows readers to chart their growing brainpower or compete against their friends.