Introduction
This instruction manual provides detailed guidance for the assembly, operation, and maintenance of your Mega Masters of the Universe Castle Grayskull Building Set. This premium building set features over 3,500 pieces, allowing for the construction of an authentic and detailed Castle Grayskull, complete with multiple levels, interactive features, and six highly articulated micro action figures.
Please read this manual thoroughly before beginning assembly to ensure a smooth and enjoyable building experience. This product is recommended for ages 14 and up.
What's in the Box
Your Mega Masters of the Universe Castle Grayskull Building Set includes:
- 1 Castle Grayskull Building Set (approximately 3,508 pieces)
- 6 highly detailed, super-articulated micro action figures: He-Man, Skeletor, Man-At-Arms, Beast Man, The Goddess, and an exclusive Sorceress
- Legendary weapons and interchangeable accessories
- A legendary weapon rack and the Orb of Grayskull
- Deluxe vintage-design packaging
- Collectible poster
- Mega Construx Easter egg

Image: The complete Mega Masters of the Universe Castle Grayskull Building Set, showing the product box and the fully assembled castle with all included micro action figures.
Setup and Assembly
The Castle Grayskull Building Set requires full assembly. Follow the included comprehensive instruction book for step-by-step guidance. Due to the large number of pieces (over 3,500), assembly may take a significant amount of time and is intended for experienced builders aged 14 and above.
- Unpack Components: Carefully open the packaging and sort the building blocks and figures. It is recommended to organize pieces by type or color to facilitate assembly.
- Consult Instruction Book: Refer to the detailed instruction book provided. Each step is illustrated to guide you through the construction process.
- Assemble Sections: The castle is designed to be built in sections. Pay close attention to the connections to ensure stability.
- Figure Assembly: Assemble the micro action figures as per their individual instructions. Ensure all accessories are correctly attached.
- Final Placement: Once assembled, the castle can be displayed. Its dimensions are approximately 19 x 61 x 36 cm.

Image: A close-up view of some of the micro action figures and various building blocks, illustrating the components before assembly.
Operating Features
The Mega Masters of the Universe Castle Grayskull Building Set is designed with several interactive features:
- Opening and Closing Castle: The entire Castle Grayskull structure can be opened and closed, revealing its detailed interior.
- Multiple Levels and Areas: Explore 3 distinct levels and 6 detailed areas, including the Throne Room, Command Center, Dungeon, and various towers.
- Functional Gate: The main gate of Castle Grayskull is functional and can be activated by the Power Sword.

Image: The He-Man micro action figure interacting with the functional gate of Castle Grayskull, demonstrating the Power Sword activation feature.
- Legendary Trapdoor: The Throne Room features the iconic, legendary trapdoor.

Image: A detailed view of the trapdoor mechanism located within the Throne Room of the assembled Castle Grayskull.
- Working Elevator: A functional elevator allows figures to move between levels.

Image: The Beast Man micro action figure demonstrating the operational elevator system within the castle structure.
- Micro Action Figures: The six included figures are highly articulated, allowing for dynamic posing and play.

Image: A close-up of the He-Man, Man-At-Arms, and Beast Man micro action figures, highlighting their detailed design.

Image: The Sorceress micro action figure alongside the glowing Orb of Grayskull, showcasing the exclusive figure and accessory.

Image: The Castle Grayskull building set displayed in its open configuration, revealing the intricate interior layout and various micro action figures positioned within.
Maintenance
To ensure the longevity and appearance of your Castle Grayskull Building Set, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to gently wipe dust from the assembled model and figures. For stubborn dirt, a slightly damp cloth can be used, but avoid excessive moisture. Do not use harsh chemicals or abrasive cleaners.
- Storage: Store the set in a cool, dry place away from direct sunlight to prevent discoloration or warping of plastic components. If disassembling for storage, keep all pieces organized in sealed bags or containers to prevent loss.
- Handling: Handle the assembled model with care, especially when moving it, to prevent pieces from detaching.
Troubleshooting
Here are some common issues and their solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Missing Pieces | Packaging error or pieces misplaced during unboxing/assembly. | Carefully check all packaging materials. If pieces are genuinely missing, contact Mega Brands customer support with your product model number (GGJ67) and details of the missing parts. |
| Difficulty Connecting Pieces | Incorrect orientation, misalignment, or excessive force. | Ensure pieces are oriented correctly as shown in the instruction book. Apply firm, even pressure. Do not force pieces together, as this can cause damage. |
| Assembled Sections are Unstable | Loose connections or incorrect piece placement. | Review the assembly steps for the affected section. Ensure all connections are fully pressed together and that the correct pieces are used in each step. |
Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 19 x 61 x 36 cm (7.5 x 24 x 14.2 inches); 5.01 Kilograms (11.04 lbs) |
| Manufacturer Recommended Age | 14 years and up |
| Model Number | GGJ67 |
| Educational Objective | Construction Skills |
| Language | Multilingual instructions |
| Number of Pieces | 3410 (Note: Product description states over 3,500 pieces, including 3,508 in the title) |
| Assembly Required | Yes (for the building set itself) |
| Batteries Required/Included | No |
| Material | Plastic |
| Color | Multicolor |
| Target Group | Children aged 14 to 17 years |
| Item Weight | 5.01 Kilograms (11.04 lbs) |
| First Available Date | April 16, 2019 |

Image: A visual representation of the assembled Castle Grayskull, indicating its approximate height of 34 cm (13.4 inches).
Warranty Information
Specific warranty details for the Mega Masters of the Universe Castle Grayskull Building Set are typically provided by the manufacturer, Mega Brands, or the retailer at the time of purchase. Please refer to the documentation included with your product or visit the official Mega Brands website for the most current warranty policy.
It is advisable to retain your proof of purchase for any warranty claims.
Customer Support
For assistance with assembly, missing parts, or any other product-related inquiries, please contact Mega Brands customer support. You can typically find contact information on the product packaging or by visiting the official Mega Brands website:
- Brand Website: www.megaconstrux.com
- Retailer Support: If purchased from a specific retailer, their customer service department may also be able to assist with returns or initial product issues.
When contacting support, please have your product model number (GGJ67) and purchase details readily available.




