BLUEHOLMEª Prentice RulesPerfect bound edition. BLUEHOLME Prentice Rules is a table top fantasy roleplaying game that emulates the game play of the original basic rule book, popularly known as the Holmes Edition or simply the Blue Book. The rules in this book allow for characters of 1st to 3rd levels, and include everything the referee could possibly need to create and run a campaign in the Underworld: monsters, magic, treasure, and well, what more do you need?