 He has also produced a 3D crossword that fits on a Rubik's Cube.Many crossword anthologies, including "The Times", "Guardian", "Telegraph", "Financial Times", and the "Herald" include cryptic puzzles by Squires, including one book devoted solely to 100 of his "Guardian" cryptics.In collaboration with Ken Guy he produced three general knowledge books on "The 1950s", "The 1960s" and "The 1970s".