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- Create A Castle BuildMaster™ Indoor Activity MEGA Kit - TOY OF THE YEAR FINALIST!
Create A Castle BuildMaster™ Indoor Activity MEGA Kit - TOY OF THE YEAR FINALIST!
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Owned by a small family MoogCo Baby is a family-owned shop. Every order supports a real family who personally stands behind what we sell — thank you for shopping small. 💚
As seen on Shark Tank! Build sand castles inside on your tabletop, said no parent ever! Now they can with our exciting new indoor line based on the split mold technology of our award winning outdoor line!
Product Highlights:
- The joy, experience and creativity of building sand castles now sits in the palm of your hand, at your kitchen table.
- Each activity kit comes with our newer version of CastleMagic compound to build amazingly detailed castles. The compound combines the best parts of Kinetic Sand and Playdough! It can be handled, picked up, stacked and the best part is it can be smashed to be reused over and over.
- The patented molds deliver pieces that can be interchanged and have the most realistic details of any castle molding system.
- No mess, does not dry out with included storage bags, holds shape and offers limitless creativity. When you are finished, included pouches prevent compound from drying out!
- Great for sensory play from kids to senior citizens!
- Build a single tower or an entire fortress; it's entirely up to you!
- Watch video tutorials on our website for tips on how to mold and sculpt using our proprietary sand for the perfect castle!
- Build, Smash and Repeat over and over!
- For ages 6 and up.
Instructions for Use:
- Close mold, insert key and turn to lock.
- Insert lid into mold and flip upside down before filling.
- Pack the CastleMagic compound in using small quantities, a little bit at a time. Pack sand into all the little crevices, using included multi- tool or back of a pen to push down. The better you pack it, the better the detail!
- Flip mold back to upright position, turn key and remove.
- Remove the lid and slowly open the mold.
- Add plastic toppers to finish the towers.
- Build, Smash, Repeat!
See it in action!
Each mega kit includes:
- 4 custom molds to build an entire kingdom
- 4 dimension forming tops
- 1.5 lbs of CastleMagic sand
- 2 locking keys
- Pack & design multi-tool
- Storage bags for sand when finished to prevent drying
- 1 large tower topper
- 4 small tower toppers
- Play Mat
- Storage Case
Read the rave review from The Toy insider's own James Zahn!
All orders are processed and shipped within a maximum of 2 to 5 business days. Please note that this is an estimated timeline and does not constitute a guarantee, as national holidays and other external factors may impact final delivery and shipping times.
🚚 Free Shipping and Discount Clarification
For qualifying orders of $100 or more, the maximum available discount applied to your order is $30.
For customizable orders, please enter your specific details in the 'Add a note' section of your cart. We kindly ask that you carefully review your input for any typos


CastleMagic feels like a mix of kinetic sand and playdough, so it holds detail but stays soft. It can be stacked, squished, and reused again and again, and included storage bags help prevent drying between sessions.

The kit includes four custom molds and interlocking pieces so kids can build a single tower or an entire fortress. Molds lock with the included keys, making assembly simple for ages 6 and up.

Patented split molds capture crisp stonework and architectural details that other molds cannot match. Use the multi-tool to pack compound into crevices for the best detail, then flip, unlock, and reveal your piece.
Pick a kit that fits your child’s age, the space you have, and how much cleanup you want.
- Age and Skill: Look for recommended ages. This kit is designed for makers aged 6 and up, and suits a range of skill levels.
- Mess and Cleanup: Choose a compound that stays contained and soft. Kits that include storage bags and a play mat keep cleanup quick.
- Kit Size and Pieces: Consider how many molds and how much compound are included, so you can plan for group play or solo projects.
- Reusability: Reusable compounds that do not dry out offer longer term value, and replaceable tools and toppers extend play.
- Where to Play: Indoor kits work best on a table or mat. Avoid carpeted surfaces for easier cleaning and clearer detail capture.
What age is this kit for?
The Create A Castle BuildMaster MEGA Kit is intended for ages 6 and up, offering appropriate challenge and safety for that range.
Will the compound make a mess, and does it dry out?
CastleMagic is low mess and stays soft, and the included storage bags help prevent drying when the compound is stored after play.
Are there small parts or choking hazards?
The kit includes small toppers and pieces, so adult supervision is recommended for younger children and it is not for children under 3 years.
How should I store the compound between uses, and can I buy refills?
Store CastleMagic in the included pouches to keep it soft. For refill availability, check the product page or contact our human customer support.
What are your shipping and return policies?
We ship from a US warehouse, offer free US shipping on orders over $100, and accept returns within 30 days; contact human customer support for help.
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