Citadel - Liquide Green Stuff Games Workshop is a British manufacturer of miniature wargames, based in Nottingham, England. Founded in 1975 to 15 Bolingbroke Road, London by John Peake, Ian Livingstone and Steve Jackson (not to be confused with the game designer American Steve Jackson) Games Workshop was originally a manufacturer of wooden boards for games like backgammon, mancala, nine men. morris and go.