 To celebrate the release (which coincided with the strip's 20th anniversary and the tenth anniversary of its absence from newspapers), Bill Watterson answered 15 questions submitted by readers.Early books were printed in smaller format in black and white.These were later reproduced in twos in color in the "Treasuries" ("Essential", "Authoritative" and "Indispensable"), except for the contents of "Attack of the Deranged Mutant Killer Monster Snow Goons".