Klotski

Klotski (from Polish klocki—wooden blocks) is a sliding block puzzle. Sometimes it only refers to the block arrangement in the right-hand-side diagram, where the largest block (in red) must be moved to the bottom middle location (marked in blue). In a more global sense, Klotski refers to a whole group of similar sliding-block puzzles where the aim is to move a specific block to some predefined location. For more information, please refer to the Block arrangement variation section below.