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Klotski (from Polish: klocki, lit. 'wooden blocks') 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 similar sliding-block puzzles where the aim is to move a specific block to some predefined location.
A similar game in China is known as the Huarong Dao (Chinese: 华容道; Chinese: 華容道), which shows unique Chinese characteristics, such as the use of one of the Four Great Classical Novels, the Romance of the Three Kingdoms.