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Get Off the Earth (1896) — The Patent Sam Loyd Took Out on a Miscount
In 1896, puzzle columnist Sam Loyd patented a rotating vanishing puzzle called Get Off the Earth. This piece traces the real mechanism behind its disappearing figure, its 1880 predecessor The Magic Egg Puzzle, its roots in Loyd's 1858 Trick Mules, and the trail this rearrangement trick has left in optical-illusion puzzles today.
The 15 Puzzle (1880) — The Unsolvable Move with Which Sam Loyd Fooled the World
In early 1880 a craze for the '15 Puzzle' swept America and Europe. But Sam Loyd, whom the world believed to be its inventor, was an impostor who only claimed authorship sixteen years after the craze had ended. This essay traces the box's true origin and the 1879 proof that the 'swapped 14-and-15' board Loyd staked his prize on is mathematically unsolvable, and rereads the legacy sliding puzzles left to modern digital puzzle design: the guarantee of solvability.
