Four connected straight lines must pass through a 3 × 3 arrangement of points in this puzzle; the lines may extend beyond the implied square.

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Your new ahaThe Nine Dots Puzzle

The Nine Dots Puzzle: A puzzle asking for four connected straight lines through a three-by-three arrangement of dots without lifting the pen. Source: Nine dots puzzle ↗

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A few more worth knowing.

17These digital-circuit components perform operations such as AND, OR and NOT.RECALL
Logic Gates
Logic gates, the building blocks of digital circuits, process inputs using operations like AND, OR, and NOT.
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18Named for George Boole, this system uses the truth values true and false.RECALL
Boolean Logic
Boolean logic, named for George Boole, operates using only the values true and false.
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19This reasoning concept notes that more items than containers force at least one container to hold multiple items.RECALL
The Pigeonhole Principle
The pigeonhole principle notes that more items than containers force at least one container to hold multiple items.
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