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 ResourcesSTEM Explorers Brainometry

Learning ResourcesSTEM 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

📏22.86 x 20.32 cm compact size

🧠Boosts critical thinking & pattern recognition

🧩34 precision puzzle pieces

Description

🧠 Unlock your brain’s full potential with every puzzle piece!

MASTER THE ART OF SHAPES - Engage with 34 vibrant, multi-colored puzzle pieces designed to challenge and sharpen your spatial reasoning.
NO BATTERIES JUST BRAINPOWER - Eco-friendly, plastic construction requires zero batteries—pure cognitive challenge, anytime, anywhere.
DESIGNED FOR FUTURE INNOVATORS - Recommended for ages 5-16, it cultivates creative thinking and problem-solving skills essential for tomorrow’s leaders.
SOLO CHALLENGE INFINITE GROWTH - Single-player format encourages focused, self-paced learning that builds confidence and intellectual curiosity.
COMPACT BRAIN TRAINING POWERHOUSE - Sized perfectly at 22.86 x 20.32 cm, it fits seamlessly into your busy lifestyle for on-the-go mental workouts.

Learning Resources STEM Explorers Brainometry is a compact, battery-free puzzle set featuring 34 multi-colored plastic pieces designed to develop critical thinking, pattern recognition, and creative problem-solving skills in children aged 5 to 16. Perfect for solo play, it offers a hands-on STEM learning experience that fits into any busy schedule.

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

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