'I cannot tell you what a relief it was to finally solve it,' the 45-year-old from Portchester, Hampshire, said. 'It has driven me mad over the years – it felt like it had taken over my life.
'I have missed important events to stay in and solve it and I would lie awake at night thinking about it.
'I have had wrist and back problems from spending hours on it but it was all worth it. When I clicked that last bit into place and each face was a solid colour, I wept.'
He's probably happy he solved it, but I predict that he is going to go through a period of depression.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.