Revolver (Beatles album) group collective since 1962, and gave them an unprecedented amount of time to prepare for a new album. Writing in "The Beatles Forever", Nicholas Schaffner cites 1966 as the start of the band's "'psychedelic' period" and adds: "That adjective implies not only the influence of certain mind-altering chemicals, but also the freewheeling spectrum of wide-ranging colors that their new music seemed to evoke." Music journalist Carol Clerk describes "Revolver" as having been "decisively informed by acid", following John Lennon and George Harrison's continued experimentation with the drug LSD since the spring of 1965.<ref name="Clerk/Uncut"> Available at Rock's Backpages (subscription required).</ref>
Cluedo was retitled because the traditional British board game "Ludo", on which the name is based, was less well known there than its American variant "Parcheesi." The North American versions of "Clue" also replace the character "Reverend Green" from the original "Cluedo" with "Mr. Green." This is the only region to continue to make such a change. Minor changes include "Miss Scarlett" with her name being spelt with one 't', the spanner being called a wrench, and the dagger renamed a knife. In the 2016 U.S. edition, the knife was changed to a dagger. And until 2003, the lead piping was