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

Learning Resources STEM Explorers Brainometry

Product ID: 397919678

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Details

Brand
Learning
Puzzle type
Assembly &
Manufacturer Minimum Age (MONTHS)
60.0
Number of pieces
34
Product dimensions
22.9L x 20.3W

📏10 double-sided STEM challenge cards

🧠Boosts critical thinking & spatial skills

🧩34 precision puzzle pieces

Description

🧠 Unlock your child’s inner genius with every shape!

COMPACT READY TO PLAY - No assembly or batteries needed—instant STEM adventure
PERFECT FOR AGES 5 TO 16 - Designed to develop critical thinking across childhood
SCREEN FREE BRAIN TRAINING - Meaningful play that sharpens logic and creativity
10 DOUBLE SIDED CHALLENGE CARDS - Progressive puzzles that grow with your child’s skills
ENGAGE WITH 34 VIBRANT GEOMETRIC PIECES - Tactile, colorful shapes for hands-on STEM fun

Learning Resources STEM Explorers Brainometry is a dynamic 3D puzzle game featuring 34 colorful geometric pieces and 10 double-sided challenge cards designed for children aged 5 to 16. It promotes critical thinking, pattern recognition, and spatial imagination through progressive STEM tasks, all in a compact, screen-free format that requires no assembly or batteries.

Specifications

Product Dimensions	22.86 x 20.32 x 0.25 cm; 294.8 g
Manufacturer recommended age	5 - 16 years
Item model number	LER9306
Educational Objective(s)	Creative Thinking, Pattern Recognition
Language:	English
Number of Game Players	1
Number of Puzzle Pieces	34
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Plastic
Color	Multi
ASIN	B097F49QYH