Let me summarize first：Around the age of 3, young children can improve their intelligence through educational toys. These toys effectively enhance children's thinking and manual skills, as they already have the memory necessary to become familiar with and accustomed to these abilities.

1. Introduction to the Functions of Educational Toys

Educational toys are, as the name suggests, designed to develop intelligence through play. Their main functions include:

1. Developing Intelligence
   Research shows that people who frequently play with educational toys have an IQ that is about 11 points higher than those who do not, significantly lowering the risk of developing dementia.

2. Stimulating Sensory Responses
   Educational toys stimulate children's visual, auditory, and tactile senses, helping them understand the world through various sensory experiences.

3. Coordinating Physical Functions
   Playing with educational toys improves children's hand-eye coordination and overall physical skills while promoting social development.

2. Categories of Educational Toys

1. Ring Toys
   Such as the Nine Linked Rings, which contain complex mathematical principles that enhance logical thinking and spatial imagination.

2. Knot Toys
   Including the Mandarin Duck Knot, these toys use the flexibility of ropes to challenge children's problem-solving skills.

3. Rope Toys
   These involve removing ropes from a designated framework, testing children's dexterity and ability to manipulate objects.

4. Puzzle Toys
   Games like the Magic Stick and Tangram require children to think outside conventional patterns, fostering creativity.

5. Comprehensive Toys
   Examples include Single Noble and Ancient Deer Mystery, which provide self-challenging experiences that improve logical reasoning.

3. Benefits of Educational Toys

1. Benefits for Children
   These toys develop intelligence and enhance manual skills, providing a joyful childhood and lowering future health risks.

2. Benefits for Elementary and Middle School Students
   They increase intelligence and social skills, improve understanding of math and logic, and better prepare children for social life.