Digimon: The Official Game Guide is a Digimon tie in/ Merchandise book which was written by John Witman and published by Harper Entertainment in June 2000. The book is based around the Digimon card game, which in turn is based around the Digimon Adventure anime series.The book is fairly thick at around 100 pages long and was originally sold in America for $9.99 and $14.95 in Canada. The book is has been out of print for an number of years but can be bought second hand from the internet. PDF scans of the entire book also exist.