Working on a drilling machine , he found the work tedious , but it gave him time to think , including about the ideas behind Cluedo .
During the Second World War , Pratt worked in an engineering factory in Birmingham that manufactured components for tanks .
Working on a drilling machine , Pratt found the work tedious , but it gave Pratt time to think , including about the ideas behind Cluedo .
During the Second World War , Pratt worked in an engineering factory in Birmingham that manufactured components for tanks .