This puzzle was created by renowned Japanese puzzle designer Nobuyuki “Nob” Yoshigahara (1936–2004), who regarded it as his absolute masterpiece.
Nobuyuki “Nob” Yoshigahara (1936–2004) was a Japanese puzzle designer, mathematician, writer, and teacher who became one of the most influential figures in recreational mathematics. Trained in applied chemistry, he created hundreds of mathematical, logic, and mechanical puzzles and authored more than 80 books.
I tried solving this one without any help and thought I had it figured out—until I hit a wall. Give it a try yourself. It’s surprisingly fun, and once you solve it, you’ll understand why Yoshigahara considered it his masterpiece.