Introduction
This manual provides instructions for the assembly, operation, and care of your Mega Hot Wheels Twin Mill Racecar Building Set. This set is designed for individuals aged 5 years and up, offering an engaging building experience and imaginative play.

Image: The Mega Hot Wheels Twin Mill building set packaging, showing the assembled red racecar and the included micro action figure.
Package Contents
Your Mega Hot Wheels Twin Mill Racecar Building Set includes the following components:
- 101 building pieces for the Twin Mill racecar.
- 1 poseable micro action figure, designed as a racecar driver.
- Instruction booklet for assembly.

Image: The fully assembled red Twin Mill racecar and the accompanying micro action figure, ready for play.
Setup: Building Instructions
Follow the step-by-step instructions provided in the included booklet to assemble your Twin Mill racecar. Ensure all 101 pieces are accounted for before beginning construction.
- Unpack all building pieces and the micro action figure from the box.
- Refer to the instruction booklet for detailed visual guides on connecting each piece.
- Carefully snap pieces together, ensuring a secure fit.
- Once the car is assembled, the micro action figure can be placed in the driver's seat.

Image: A child's hands are shown carefully connecting building blocks to construct the Twin Mill racecar.

Image: Various building pieces for the Twin Mill racecar are laid out, with a tablet in the foreground showing digital assembly instructions.
The building pieces are designed to be compatible with other MEGA Construx building sets and major building block brands, allowing for expanded creative possibilities and custom model creation.

Image: An orange and a blue building block are shown, illustrating the compatibility of the pieces with other major building block brands.
Operating the Twin Mill Racecar
Once assembled, the Twin Mill racecar is ready for play. The vehicle features rolling wheels for dynamic movement.
- Driver Placement: Gently place the micro action figure into the driver's seat of the racecar. The car's roof can be removed to facilitate easier placement.
- Movement: Push the car along a flat surface to simulate racing. The wheels are designed to roll smoothly.
- Customization: The modular design allows for parts to be interchanged with other compatible building sets to create unique vehicle designs.

Image: The micro action figure is shown being lowered into the driver's seat of the Twin Mill racecar, with arrows indicating the placement.

Image: A child is shown smiling and pushing the assembled Twin Mill racecar across a surface, demonstrating play.
Maintenance
To ensure the longevity of your building set, follow these simple maintenance guidelines:
- Cleaning: Wipe the building pieces and figure with a soft, dry cloth. For stubborn dirt, a slightly damp cloth can be used, followed by immediate drying. 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.
- Disassembly: If disassembling the set, do so carefully to avoid damaging the connection points of the blocks.
Troubleshooting
If you encounter any issues with your building set, consider the following:
- Missing Pieces: Carefully check the packaging and surrounding area for any small pieces that may have been overlooked. If pieces are genuinely missing, contact Mattel customer support.
- Difficulty Assembling: Refer back to the instruction booklet. Ensure you are using the correct pieces for each step and applying appropriate pressure to connect them.
- Loose Connections: Ensure pieces are fully pressed together until they click or feel secure. Over time, connections may loosen with repeated assembly/disassembly.
Specifications
| Feature | Detail |
|---|---|
| Product Model Number | HDJ90 |
| Number of Pieces | 101 |
| Product Dimensions | 2.5 x 4.75 x 1.75 inches (6.35 x 12.07 x 4.45 cm) |
| Item Weight | 5.6 ounces (158.76 grams) |
| Manufacturer Recommended Age | 5 years and up |
| Release Date | December 11, 2021 |
| Manufacturer | Mattel |

Image: The assembled Twin Mill racecar with an arrow indicating its length, specified as 5.34 inches (13.58 cm).

Image: A composite image showing top, side, three-quarter, and rear views of the assembled Twin Mill racecar.
Warranty and Support
For information regarding product warranty or to obtain assistance with your Mega Hot Wheels Twin Mill Racecar Building Set, please contact Mattel customer support directly. Contact details can typically be found on the product packaging or on the official Mattel website.
You may also visit the Mattel Store on Amazon for additional product information and support resources.