Klotski
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Klotski is a sliding block puzzle thought to have originated in the early 20th century. The name may refer to a specific layout of ten blocks, or in a more global sense to refer to a whole group of si
In a Klotski puzzle, the largest block must be moved to the bottom middle location so that it can be slid over the border, without any of the other blocks being removed in this way.
Huarong Dao
The Chinese wooden game Huarong Dao, thought to date from the 1930s, follows the same pattern as Klotski.
Japanese variants with shogi pieces
15 puzzle
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The 15 puzzle is a sliding puzzle. It has 15 square tiles numbered 1 to 15 in a frame that is 4 tile positions high and 4 tile positions wide, with one unoccupied position. Tiles in the same row or co
Klotski
…ultimate origin of this game. One game—lacking the 5 × 4 design of Pennant, Klotski, and Chinese models but a likely inspiration—is the 19th century 15-puzzle, where fifteen wooden squares had to be rearranged. It is suggested that unless a 19th-century Asian evidence is found, the most reasonably likely path…
U.S. political cartoon about finding a Republican presidential candidate in 1880
Sam Loyd's 1914 illustration of the unsolvable variation