Wil sets of Krazy gears and funny bricks and wonder gears all interchange?

I am sorry, but I do not know the answer to this. I only have the Krazy gears at this time.

I don't know for certain but based on the quality of these, my guesstimate is that VERY LITTLE consideration went into safety of these. It is a complete waste of money. The quality is as bad as the worst you can get. I typically buy wooden toys for my twin toddlers but the "gears" were something I thought would be challenging for them. I bought two sets and because I sent them by shipping company to me to Europe, it was too costly to return them. In the trash they went. Don't waste your money. MagnaTiles are a much better long lasting ( yet more expensive) alterntive that will last and keep them interested forever!

Where can I get a replacement piece for a missing piece that it didn't come with?

Well, I would think that AMAZON/Gear Building Toy Co. should send that to you at "NO CHARGE".

Will these parts fit with learning resources gears gears gears! building sets?

No they will not. We have sets like this and we also have the learning resource gears. It is too late for me to return them or I would have so the gears could be used together for me creativity and fun. I will say that while the learning recourses are a little more pricey they seem much easier for my girls (3 and & 5 years) to use.

Gear Building Toy Set Interlocking Learning Blocks Motorized Spinning Gears

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Description

⚙️ Spin up creativity and STEM skills with every click!

EXPANDABLE FUN - Combine multiple sets to build mega-structures and keep the innovation flowing—perfect for collaborative play and family bonding.
EFFORTLESS MOTION - Built-in motor spins all gears with a simple switch—no manual cranking needed, powered by just one AA battery.
STEM SKILLS IN ACTION - Develop critical thinking, engineering, and motor skills through hands-on play that’s as educational as it is fun.
COLORFUL COGNITIVE BOOST - Six bright colors enhance learning with sorting, matching, and color recognition challenges for early development.
ENDLESS CREATIVE POSSIBILITIES - 81 precision interlocking pieces let you build playgrounds, gears, and more—no limits to your imagination.

The Krazy Gears 81-piece Gear Building Toy Set combines colorful interlocking blocks and motorized spinning gears to inspire creativity, critical thinking, and early engineering skills in children aged 3 and up. Featuring a battery-powered motor for effortless gear motion and vibrant colors for enhanced learning, this set encourages hours of educational play and limitless design possibilities.

Specifications

ASIN	B012EBC0OG
Age Range Description	Baby,Kid
Best Sellers Rank	#158,921 in Toys & Games ( See Top 100 in Toys & Games ) #36 in Toy Interlocking Gear Sets
Brand Name	Krazy Gears
Color	Multicolored
Customer Reviews	4.0 4.0 out of 5 stars (744)
Educational Objective	Creative Thinking, Engineering Skills, Logical Thinking, Motor Skills, Problem Solving Skills, Sorting Skills, Team Building Skills
Item Dimensions	3 x 2 x 2 inches
Manufacturer	Krazy Gears
Manufacturer Maximum Age (MONTHS)	36
Manufacturer Minimum Age (MONTHS)	36
Manufacturer Part Number	FBA_PlaygroundEdition
Material Type	Plastic
Model Number	FBA_PlaygroundEdition
Number of Batteries	1 AA batteries required.
Number of Packs	1
Number of Players	1
Operation Mode	Manual
Power Source	battery powered
Set Name	Krazy Gears
Size	Medium, Small
Supported Battery Types	1 AA battery
Theme	Cartoon
UPC	787551507157 734869201611
Unit Count	81 Count

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