What are the classic intellectual toys in ancient times?

There were many classic intellectual toys in ancient China. I know the following. I list their names and attach their corresponding Baidu Encyclopedia addresses. Let's list all the names first: Nine Rings, Huarong Road, Tangram, Kongmingsuo, T Mystery, Dragon Tail, Snake Ruler, Layer upon Layer, Clever Buckle, and Twelve Pieces of Trouble.

The Chinese Ring

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Huarong Road (a traditional puzzle, including sliding wooden blocks, based on the plot in Romance of the Three Kingdoms)

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tangram

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Kongmingsuo/Lubansuo

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T-puzzle

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Dragon wags its tail.

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Magic ruler/snake ruler

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tier upon tier

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Smart button /M button

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Twelve nerve-racking things

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How to buy: Some of these intellectual toys can be bought in stores, some can be bought online, and you can also go to Taobao and other websites to find sellers.

How to untie: Many of these intellectual toys need to be disassembled manually. If you can't solve it, you can search for video tutorials online. At the same time, you can go to the website "Puzzle Bar" of "Beijing University Student Puzzle Toy Club". This website has many ways to solve puzzles. Attach the website address:/yizhiba/index.html.