China

A mechanical puzzle of linked rings on a handled bar: following two simple rules, take the rings off one by one, or put them back on. The classic nine-ring set takes hundreds of moves.

A sliding block puzzle on a 4×5 board: shuffle blocks of different sizes to get the 2×2 big block out through the bottom exit. Known in China as Huarong Dao and in Japan as Hakoiri Musume.

A 3D interlocking wood (burr) puzzle: notched sticks assemble into a rigid cross without glue; take apart and reassemble.

A Chinese seven-piece dissection puzzle in which all pieces are rearranged without overlap to reproduce a silhouette.

A 15-piece Qing-dynasty silhouette puzzle by Tong Yegeng, with some curved pieces. Not the same as the seven-piece Tangram, which is sometimes also called "Yizhi tu."