By James, Dan, Ordnance Survey
By Fiore, Albie, Mero, Laszlo, Rubik, Professor of Interior Design Erno
By David Bird
By Russell, Kenneth, Carter, Philip
By Tremaine, Jon
By Coats, Lucy, Coates
By Howard-Williams, Jeremy
By Holland, Charlie
By Molly Perham
By Hill, Gordon
By Newby, Peter
By Tubal Cain
By Victor Serebriakoff (Honorary President of World MENSA)
By Serebriakoff, Victor
By Bodycombe, David J.
By Rose, Andrew.
By Price, Alison, Price, Alison, John, Elton
By Alfred Sheinwold
By Tibballs, Geoff, Carlton Books
By Puzzle House
By Gale, Harold
By Anon
By Williams, Gareth
By Robbins, Joyce
By North, Freddie, Flint, Jeremy
By King, Lucien
By Jacobs, Byron
By SADLER, Matthew
By Kahn, Michal, Batchelor, Lucy Jane