Cats, books, 1000 piece puzzle - what else is there to say? Marmaduke is a fun loving cat puzzle by British artist Geoffrey Tristram. He has painted dozens of cats, with Marmaduke being his first feline subject. Tristram lives in the West Midlands and is also a cartoonist and comedy writer. Assembled puzzle measures approximately 19.25 x 26.625 inches. The included poster measures 12.45 x 9 inches.