Revolver (Beatles album) as the Beatles'. While also highlighting the importance of the production, David Howard writes that "Revolver" was a "genre-transforming album", on which Martin and the Beatles had "obliterated recording studio conventions". Combined with the similarly "visionary" work of American producer Phil Spector, Howard continues, through "Revolver", the recording studio had become "its own instrument; record production had been elevated into art." Whereas "Sgt. Pepper" had long been identified as the Beatles' greatest album, since the 2000s "Revolver" has often surpassed it in lists of the group's best work. Sheffield cites the album's 1987 CD release, with the full complement of
Cluedo set of cards, and a "Detective's Notes" pad on which are printed lists of rooms, weapons and characters, so players can keep detailed notes during the game. Depending on edition, the playing pieces are typically made of coloured plastic, shaped like chess pawns, or character figurines. Occasionally they are made from wood or pewter. The standard edition of Cluedo comes with six basic tokens representing these original characters: The weapon tokens are typically made out of unfinished pewter, with the exception of the rope, which may be made of plastic, metal, or string depending on edition. Special editions have included