By Rigby, Christopher
By Steve Parker, Parker, Steve, MacCuish, Isla
By Gifford, Clive
By Janet Dyson
By Miles Kelly Publishing
By Puzzle House
By Arcturus Publishing
By Al Seckel
By David J. Bodycombe
By Thomas Fink, Yong Mao
By Anonymous
By Moran, Paul, Forizs, Gergely, Batten, John, Linley, Adam, Santillan, Jorge
By Moore, Dr Gareth, Turing, Sir John Dermot, Turing, Sir John Dermot
By The Turing Trust, Eric Saunders
By Arcturus Publishing Limited
By Pavitte, Thomas
By Sinden, Pete
By Chisholm, Alastair
By Schrey, Sophie, Marx, Jonny, Moran, Paul, Paul Moran
By Taylor, Frankie
By Alex Bellos
By Bellos, Alex
By Priddy, Roger