These puzzles cross-reference categories in a table, eliminating possibilities until each item has a unique match.

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Math & LogicOne small aha

Your new ahaLogic Grid Puzzles

Logic Grid Puzzles: Solved by eliminating possibilities using a grid of clues. Source: Logic puzzle ↗

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16Four connected straight lines must pass through a 3 × 3 arrangement of points in this puzzle; the lines may extend beyond the implied square.RECALL
The Nine Dots Puzzle
The nine dots puzzle illustrates how an unstated boundary can restrict thinking. The lines may extend beyond the square implied by the dots.
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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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