Number Sequence What Comes Next? A Sequence With Exactly One Rule
Most sequence puzzles are broken, because several answers fit. This one is generated from a single stated rule, and a validator recalculates the answer independently.
Number Puzzles
Sequence puzzles get a bad name because so many of them have several equally valid answers. Ours are generated from a single explicit rule, and the validator recalculates the answer independently.
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Puzzle This Matchstick Equation Is Wrong. Move One Stick to Fix It
A matchstick puzzle with exactly one solution, found by searching every legal single-stick move before publication. Ambiguous matchstick puzzles are the most common broken puzzle online.