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The "nine dots" puzzle. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen. The nine dots puzzle is a mathematical puzzle whose task is to connect nine squarely arranged points with a pen by four (or fewer) straight lines without lifting the pen or retracing any lines.
In 1970, the phrase think outside the dots appears without mentioning the nine dots puzzle. [13] [7] Finally, in 1971, the specific phrase think outside the box is attested, again appearing together with the nine dots puzzle. [14] [15] In 1976, the phrase is used in England [16] and 1978 in the USA, [17] both without mentioning the nine dots ...
The Nine Dots Puzzle is the first known puzzle game where the player has to connect dots. But in this variant the goal is not to draw a picture, but to solve a logic puzzle . The emergence of connect the dots games in the printed press takes place in the early 20th century.
I suggest that the "Nine dots puzzle" section (and its subsections about solving in three dimensions, and a prize that was named after it) be split into a separate article at Nine dots puzzle. It's a classic puzzle with a strong and sourceable pedigree beyond its connection to the 1970s management jargon, which it pre-dates by some sixty years.
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