Equations vs 15 Puzzle
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Equations
A mathematical strategy game created by Layman Allen in 1963 as part of the WFF 'N PROOF educational series, designed to build algebra readiness through equation building.
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15 Puzzle
The 15 Puzzle is a sliding-tile puzzle consisting of fifteen numbered square tiles arranged in a four-by-four frame with one empty space. Players move adjacent tiles into the gap to restore a specified numerical order, and only half of all apparent arrangements are mathematically reachable from any given starting position. The puzzle became an international craze around 1880 and remains a standard...
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