I
Ian Stewart
Ian Nicholas Stewart FRS CMath FIMA is a British mathematician and a popular-science and science-fiction writer. He is Emeritus Professor of Mathematics at the University of Warwick, England. --Wikipedia
Computer puzzles for Spectrum & ZX81
Challenge your mind with a collection of computer puzzles designed for Spectrum and ZX81 users. This book offers a variety of brain-teasers and logical problems to test your programming and problem-solving skills. Dive into the world of early microcomputing with these engaging and stimulating challenges.