Editor’s pick
CrunchLabs by Mark Rober The Crunchinator
A hand-cranked crusher that shows how gears multiply force
About $35brand list price View on Amazon
Thames & Kosmos Mega Cyborg Hand
Build a giant wearable robot hand powered by water pressure.
Best for kids who want a big build they can wear and show off.
$44.95Thames & Kosmos list price
This is Thames & Kosmos’s own list price (checked November 13, 2026). Amazon’s price is often lower; tap above for today’s price. Paid link: Electroys may earn a commission at no extra cost to you. Listing verified October 28, 2026. See Thames & Kosmos’s product page.
At a glance
- Age guidance
- Ages 7+
- Price
- $44.95 list price
- Screen needed
- No, fully screen-free
- Batteries
- Not needed
- Adult help
- Some, for setup
- Play style
- Solo or together
- What it is
- 200+ part kit for a wearable hydraulic hand, color manual
- Great for
- Holiday, Birthday, Rainy Day
Kids assemble an oversized mechanical hand from 200-plus plastic parts, then fill its piston tubes with water so the fingers open, close and grip when they move their own hand inside it. The full-color manual explains how the same hydraulic and pneumatic ideas show up in real industrial robots.
Why we picked it
- 01No motors or batteries: every movement comes from the kid's own hand pushing water and air
- 02Adjusts to fit the wearer, so the finished hand grabs and lifts real objects
- 03Big, satisfying build that ends in a toy kids actually want to wear and show off
What they’ll learn
Always follow the manufacturer’s age and safety guidance. Small parts may be a choking hazard for children under 3.
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