The Hedgehog in the Cage puzzle is a Czech classic, originally introduced in the 1940s and inspired by the fictional story in Jaroslav Foglar's book Záhada hlavolamu ("The Mystery of the Puzzle"). This puzzle was designed by inventor Václav Špatný, whose creation became a beloved cultural symbol in Czechoslovakia. The "hedgehog" represents the character's search for a secret and a key to unlocking further mysteries. Over the decades, the puzzle has been manufactured in various forms, maintaining its popularity as a fun yet challenging mechanical puzzle. Its design and cultural impact are celebrated in both local and international puzzle communities, often featured in collections due to its historical significance.