By The Puzzle Society
By Collins Dictionaries
By Collins
By Robert Allen
By Collins Dictionaries, Collins Puzzles
By Ivy Press
By Publications International ltd, Brain Games
By Dr. Gareth Moore, Mensa Ltd
By Telegraph Group Limited
By Erwin Brecher
By Nick Fawcett
By Gyles Brandreth
By Collins Dictionaries, Deej Johnson
By Parragon Books Ltd
By Compiled By Barbour Staff
By Gareth Moore
By The Times Mind Games, .
By Fox, Hayden
By Publications International Ltd.
By Kaye, Harry
By National Geographic Kids
By Moore, Gareth
By Fatsis, Stefan
By Editors of Thunder Bay Press