Instruct: Classify the given Amazon review as either positive or negative.
Query: Great gift for crossword puzzlers.

My mom is a habitual crossword player, and this turned out to be the perfect gift for her.This book is an amazing collection of unusual words including their definition, pronunciation and use in a sentence. It's like the author took a dictionary, removed all the words you already know, and left only those odd words you never knew existed. Great stuff and very handy.