Sharpen your logical thinking skills with Gridworks! Working through this series of challenges, from warm-up to expert, will boost your skills and your confidence. As you consider the given visual clues, both positive and negative, you move magnets to fill in the grid correctly. This spiral bound book is ideal to take on the road. I bought this book as a gift for our 7th grader, but the younger kids (and adults) were just as eager to work through it when he finished. Complete the grid. Deduce the answer! You will learn to love logic.