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

📏Compact 25.4x22.86x11.43 cm size

🧠Boosts critical thinking & pattern recognition

🧩34 precision puzzle pieces

Description

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

COMPACT PORTABLE - Lightweight and travel-friendly design lets you bring STEM exploration wherever inspiration strikes.
SCREEN FREE STEM FUN - No batteries or assembly needed—just pure hands-on learning that fits perfectly into any busy schedule.
MASTER THE ART OF SHAPES - Engage with 34 vibrant, multi-colored puzzle pieces designed to challenge and sharpen spatial reasoning.
BRAIN BOOSTING CHALLENGES - Train your mind with tricky sorting and geometry puzzles that enhance creative thinking and problem-solving skills.
PERFECT FOR GROWING MINDS - Recommended for ages 5 to 16, making it the ideal brain workout for kids and teens eager to excel.

Learning Resources STEM Explorers Brainometry is a multi-colored, 34-piece plastic puzzle set designed for ages 5-16. It promotes critical thinking, pattern recognition, and creative problem-solving through hands-on STEM challenges without the need for batteries or assembly.

Specifications

Product Dimensions	25.4 x 22.86 x 11.43 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
tech_spec_battery_description_toys	No batteries required
Material Type(s)	Plastic
Color	Multi
Release date	30 September 2021
ASIN	B097F49QYH

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$254

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Antigua and Barbudastore

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TrustScore 4.5 | 7,300+ reviews