Using exactly four straight lines, without taking your pen off the (virtual) paper, can you join all nine dots?
A Charming Puzzle – Twentieth Century Standard Puzzle Book, A. Cyril Pearson.
Using exactly four straight lines, without taking your pen off the (virtual) paper, can you join all nine dots?
A Charming Puzzle – Twentieth Century Standard Puzzle Book, A. Cyril Pearson.