Instruct: Classify a review as either positive or negative.
Query: A guide to Shakespeare's most puzzling play

Twelfth Night is one of Shakespeare's many classics; yet the play remains the most puzzling of all. It's popular but challenging: thus the need for John R. Ford 's TWELFTH NIGHT: A GUIDE TO THE PLAY , which joins others in the 'Greenwood Guides to Shakespeare'. Plenty of other titles have offered critical analysis: what makes this one different is its inclusion of the play's textual history and changes, explanations of underlying history and influence, and a gathering of criticism and analogues under one cover. The inclusion of the sum of critical thinking about Twelfth Night makes A GUIDE TO THE PLAY an essential addition to any serious high school or college-level collection where Shakespeare's works are studied.