Would this be suitable for a highly precocious 4-year-old?

I would say yes most definitely. What my grandchildren enjoyed about this product is the cards to give them ideas of things that they can make with the blocks they found it very entertaining and it's been inspired in inspired creative and talking to them things if I following visual directions

Can you purchase more challenge cards?

I do not know but I would suggest that you try to email the company that makes this item you may be able to purchase on there site, Or try amazon maybe they have a generic type of card

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Learning Resources STEM Explorers Brainometry - 34 Pieces, Ages 5+ STEM Toys for Kids, Brain Teaser Toys and Games, Kindergarten Games

Learning Resources STEM Explorers Brainometry - 34 Pieces, Ages 5+ STEM Toys for Kids, Brain Teaser Toys and Games, Kindergarten Games

Product ID: 549768038

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Details

Brand
Learning
Puzzle type
Sequential
Number of Pieces
34
Product Dimensions
22.9L x 20.3W
Theme
Building

📏1.5-inch tactile blocks

📚10 double-sided challenge cards

🧩34 durable puzzle pieces

Description

🧠 Unlock your child’s genius with hands-on STEM fun!

SCREEN FREE FOCUS - Encourage deep concentration and creativity without digital distractions—ideal for home, classroom, or travel.
BRAIN BOOSTING PLAY - Ignite critical thinking & math skills with vibrant pattern matching challenges designed for curious minds aged 5+.
DURABLE ORGANIZED - Robust plastic pieces and coated cards housed in a sleek storage box built to withstand daily STEM adventures.
HANDS ON EXPLORATION - Engage fine motor skills and spatial reasoning through tactile, perfectly sized blocks that invite active problem-solving.
PROGRESSIVE STEM CHALLENGES - 10 double-sided activity cards offer scalable difficulty, growing alongside your child’s cognitive development.

Learning Resources STEM Explorers Brainometry is a 34-piece educational puzzle set designed for children aged 5 and up. Featuring colorful, tactile blocks and 10 double-sided challenge cards, it promotes critical thinking, spatial awareness, and fine motor skills through progressive STEM activities. Durable and screen-free, this set offers engaging, hands-on learning that grows with your child’s abilities.

Specifications

Educational Objective(s)	Color Recognition, Creative Thinking, Memory Skill
Language:	English
Model Number	LER9306
Number of Puzzle Pieces	34
Assembly Required	No
Batteries Required	No
Batteries Included	No
Material Type(s)	Plastic
Product Dimensions	22.86 x 20.32 x 0.25 cm; 294.8 g
Item model number	LER9306
Manufacturer	Learning Resources
Country of Origin	USA
Item Weight	295 g