Hardy obtained copyright for a game named Pennant Puzzle in 1909, manufactured by OK Novelty Co., Chicago. Patent 668,386 in 1900 for a sliding puzzle of six squares and four rectangles, which is one of the first known occurrences of sliding puzzle with non-equal blocks. Patent 516,035 in 1893 for a sliding puzzle of identically shaped rectangles, which according to Edward Hordern, is the first known sliding puzzle with rectangular blocks. Around this time, patents appeared for puzzles using differently shaped blocks. The 15-puzzle enjoyed immense popularity in western countries during the late 19th century. 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. However, the early cognate of Klotski closest in design dates to 1909 in Chicago. There are many confusing and conflicting claims, and several countries claim to be the ultimate origin of this game. It is still unknown which version of the puzzle is the original. There was no known widely used name for the category of sliding puzzles described before Klotski appeared. The sliding puzzle had already been trademarked and sold under different names for decades, including Psychoteaze Square Root, Intreeg, and Ego Buster.
#OPEN SOURCE KLOTSKI GAME WINDOWS#
The earliest known reference of the name Klotski originates from the computer version for Windows 3.1 by ZH Computing in 1991, which was also included in Microsoft Windows Entertainment Pack. A screenshot of the "forget me not" level in the Windows Entertainment Pack version of the game
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