Prima's Pokemon Crystal strategy guide is very well written, and is beautifully designed. It has a great deal of information on items held, where they are found and their uses. It has a thorough section on the Pikachu 2 GS and held items from Pokemon Gold/Silver/Crystal, as well as Red/Blue/Yellow and an extensive section on types, new babies and breeding. Most all of this can be found in Prima's Gold/Silver Complete Pokedex guide. This book does not have information on trainers' rosters in the game save for the Gym Leaders and the detailed section on the Elite Four, the Kanto Gym Leaders and the final trainer, Red. This isn't important to some consumers, but it is to me. The book also has little information on the new Battle Tower which is supposed to be near Olivine City, there is only one mention of it in the book and it is nowhere on the Johto map. It is extremely easy to overlook. I feel that this book may have been rushed, reminiscent of the "Gold/Silver" rush when Gold/Silver first came out. Prima should have included at least something pertaining to the Battle Tower. It is not fair for consumers to buy more than one strategy guide for one game. If I want to purchase additional guides it should be based on the content not the lack thereof. Hopefully Prima will publish one that includes more Battle Tower information, until then, I recommend you wait for Versus Books or buy Nintendo's book. Prima's guide is nicely done, though.