Starting from any point and without lifting your pen from the page, can you draw 4 straight lines, such that each of the nine dots has at least one line running through it?
Yes, it’s the old ‘nine dot’ problem, first popularized by Sam Loyd around the turn of the last century, and used in pretty much every creativity training session since.
The answer is well-known. However, there are several other lesser known variants of the puzzle. For example, how about….
Starting from any point and without lifting your pen from the page, can you draw 3 straight lines, such that each of the nine dots has at least one line running through it?
and how about….
Starting from any point and without lifting your pen from the page, can you draw 1 straight line, such that each of the nine dots has the line running through it?
The answer to this puzzle, and 100 others, can be found in a new kindle ebook called PUZZLED, and is available in the UK here and USA here.