The Adventure of the Greek Interpreter Sherlock Holmes, far from being a one-off in terms of his powers of observation and deductive reasoning, in fact has an elder brother whose skills, or so Holmes claims, outstrip even his own. As a consequence of this, Watson becomes acquainted with the Diogenes Club and his friend's brother, Mycroft. Mycroft, as Watson learns, does not have the energy of his younger brother and as a consequence is incapable of using his great skills for detective work: In spite of his inertia, the elder Holmes has often delivered the correct answer to a problem that Sherlock has brought to him.
Sherlock Holmes pastiches note as Holmes, his mind briefly clear, admits to Watson that he knows that his powers are failing him but simply cannot think clearly enough to get past his age. Everett Kaser has published a series of free reflection games (puzzles) with names referring to Sherlock Holmes stories: "Sherlock: The Game of Logic", "Dinner with Moriarty", "Watson<nowiki>'</nowiki>s Map", "Baker Street", "Scotland Yard" "Inspector Lestrade", "Mrs. Hudson", "Reichenbach Falls", "Queen's Gambit", "Mycroft<nowiki>'</nowiki>s Map". Sherlock Holmes, however, does not appear in the games, except some very small icons. In "Midnight Mysteries: Haunted Houdini" a hidden-object/puzzle video game released in 2012 by MumboJumbo,