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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.
The "nine dots" puzzle (left) has the goal of linking all 9 dots using four straight lines or less, without lifting the pen. Its solution (right) is to draw those lines "outside the box". Since at least 1954, the nine dots puzzle has been used as a metaphor of the type "think beyond the boundary".
The Nine Dot Problem is a classic spatial problem used by psychologists to study insight. The problem consists of a 3 × 3 square created by 9 black dots. The task is to connect all 9 dots using exactly 4 straight lines, without retracing or removing one's pen from the paper.
The emergence of connect the dots games in the printed press takes place in the early 20th century. These games were published with other puzzle games as pastime for children on the Sunday edition. While the first books containing connect the dots games exclusively were printed in 1926 by Ward, Lock & Co. [4] A mostly complete puzzle
When posing it in the early 20th century, Henry Dudeney wrote that it was already an old problem. It is an impossible puzzle: it is not possible to connect all nine lines without crossing. Versions of the problem on nonplanar surfaces such as a torus or Möbius strip, or that allow connections to pass through other houses or utilities, can be ...
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[4] [5] [6] Muddy children puzzle is a variant of the well known wise men or cheating wives/husbands puzzles. [7] Hat puzzles are induction puzzle variations that date back to as early as 1961. [8] In many variations, hat puzzles are described in the context of prisoners. [9] [10] In other cases, hat puzzles are described in the context of wise ...