Klotski Puzzle

thingiverse

Klotski, originating from the Polish word klocki meaning wooden blocks, is a sliding-block puzzle believed to have emerged in the early 20th century. The name likely refers to a specific configuration of ten blocks or more broadly to a collection of similar puzzles that involve moving a designated block to a predetermined location. In most Klotski puzzles, the largest block must be strategically moved to the bottom middle spot so it can slide over the border without displacing any other blocks in this manner.