1. Introduction
This instruction manual provides detailed guidance for the assembly, operation, and maintenance of your Mattel MEGA Masters of The Universe Eternia Battleground Toy Building Set, Model HFF28. Please read these instructions carefully before beginning assembly to ensure correct construction and safe use of the product. This set is designed for ages 8 and above.
2. Product Overview
The MEGA Masters of The Universe Eternia Battleground Building Set allows you to construct an iconic battle scene. Key features include:
- Eternia Tower: A multi-level buildable tower with three stories, designed for both indoor and outdoor play scenarios. The main entrance features a lion's head design.
- Attak Trak Vehicle: A buildable tank vehicle equipped with rolling tracks, suitable for various play environments.
- Communications Station: An integrated station within the set for strategic play.

Figure 2.1: Packaging of the Eternia Battleground Building Set, showing the assembled tower, Attak Trak, and included figures.
3. Package Contents
Before beginning assembly, please verify that all components are present. The package should contain:
- Building blocks for the Eternia Tower (approximately 646 pieces).
- Building blocks for the Attak Trak vehicle.
- Various accessory pieces for the communications station and battleground details.
- Instruction booklet (this document).
- Character figures (e.g., He-Man, Beast Man, and others as depicted on packaging).

Figure 3.1: All major components of the Eternia Battleground set, including the fully assembled tower, Attak Trak, and character figures.
4. Assembly Instructions
Follow these steps carefully to assemble your Eternia Battleground set. It is recommended to sort pieces by color and type before beginning.
4.1. Assembling the Eternia Tower
- Base Construction: Begin by connecting the large base plates to form the foundation of the tower. Ensure they are securely interlocked.
- First Level Walls: Build up the walls of the first level, paying close attention to the placement of the lion's head entrance pieces.
- Lion's Head Mechanism: Install the jaw mechanism for the lion's head entrance. Test its movement to ensure it opens and closes smoothly.
- Second and Third Levels: Continue building upwards, adding the second and third floor sections. Integrate any internal features or traps as indicated in the detailed diagrams.
- Tower Details: Attach decorative elements, flags, and any external armaments to the tower structure.

Figure 4.1: He-Man positioned at the entrance of the Eternia Tower, demonstrating the scale and detail of the assembled structure.

Figure 4.2: Close-up of the Eternia Tower's lion head entrance, showing its detailed construction and play features.
4.2. Assembling the Attak Trak Vehicle
- Chassis Assembly: Connect the main chassis pieces of the Attak Trak.
- Track Installation: Attach the rolling tracks to the sides of the chassis. Ensure they are free to rotate.
- Cockpit and Weapons: Build the cockpit area and attach any weapon accessories or decorative elements.

Figure 4.3: The assembled Attak Trak vehicle with a character figure, highlighting its rolling tracks and design.
4.3. Assembling the Communications Station
- Base and Console: Assemble the base of the communications station and attach the console pieces.
- Details: Add any screens, levers, or other small details to complete the station.

Figure 4.4: He-Man figure operating the communications station, located within the Eternia Tower.
5. Operating Instructions
Once assembled, the Eternia Battleground set offers various interactive play features:
- Eternia Tower Entrance: The lion's head entrance can be manually opened and closed to allow figures to enter or exit the tower.
- Internal Traps: The tower may include hidden traps or mechanisms. Refer to the detailed assembly diagrams for specific activation methods. For example, some sections may feature a jaw trap.
- Attak Trak Movement: The Attak Trak vehicle features rolling tracks, allowing it to be manually pushed across surfaces for dynamic play.
- Communications Station: Figures can be positioned at the communications station to simulate strategic planning or receiving messages.

Figure 5.1: Demonstration of a figure caught in the lion's mouth trap feature of the Eternia Tower.

Figure 5.2: An internal trap mechanism within the Eternia Tower, designed to capture figures.
6. Maintenance
To ensure the longevity and cleanliness of your building set:
- Cleaning: Wipe the building blocks and figures with a soft, damp cloth. Avoid 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.
- Inspection: Periodically inspect all parts for any damage or wear. Replace any broken pieces if necessary.
7. Troubleshooting
If you encounter issues during assembly or play, consider the following:
- Missing Pieces: Double-check the packaging and surrounding area. If pieces are genuinely missing, contact Mattel customer support.
- Difficulty Connecting Pieces: Ensure pieces are correctly oriented and apply firm, even pressure. Avoid forcing pieces together, which can cause damage.
- Loose Connections: Re-examine the assembly steps for the specific section. Ensure all connecting studs are fully engaged.
8. Specifications
| Attribute | Detail |
|---|---|
| Brand | Mattel |
| Model Name | HFF28 |
| Set Name | Masters of The Universe Eternia Battleground |
| Age Range Description | 8 years - 12 years (Manufacturer Maximum Age: 84 months) |
| Material Type | Plastic |
| Item Dimensions (LxWxH) | 17.5 x 11.5 x 2 inches |
| Item Weight | 1.1 Kilograms |
| Assembly Required | Yes |
| Number of Players | 4 (recommended) |
| Educational Objective | Team Building Skills |
9. Safety Information
Please observe the following safety guidelines:
- Choking Hazard: This set contains small parts and is not suitable for children under 3 years of age.
- Adult Supervision: Adult supervision is recommended during assembly and play, especially for younger children within the recommended age range.
- Proper Use: Use the product only as intended. Do not modify the set, as this may compromise its structural integrity and safety.
- Disposal: Dispose of packaging materials responsibly.
10. Warranty and Support
Mattel products are manufactured to high-quality standards. For information regarding warranty, missing parts, or customer support, please visit the official Mattel website or contact their customer service department directly.
Mattel Customer Service: service.mattel.com