By Telegraph Group Limited
By Daily Mail
By Helen Barton
By Charles Phillips
By Igloo Books
By Russell, Ken, Carter, Philip J.
By David J. Bodycombe
By Drew, Paul, Stirling, Peter
By The Puzzle Society
By The Times Mind Games, Richard Browne
By The Times Mind Games
By Telegraph Media Group Ltd
By David Quantick
By Bill Edgar
By ITV Ventures Ltd
By Asmodee Group, Jason Ward, Z-Man Games
By National Railway Museum
By Dr Gareth Moore
By Have I Got News For You
By Paul Sloane, Des MacHale
By Anonymous
By Andy Meisler
By Cary McNeal
By Robert Allen
By Preston, Roy, Preston, Sue, Roy Preston, Sue Preston