You can select any material you find around your house to build with. Start by making your sled. Once your sled is done create your hill. Then try it out!!
Have fun!
Hill with recycled materials, or blocks, and lego
Lids, tape and a chair
Books
paper, pans, or pillows
Lego Sled
Craft materials
Recycled materials like boxes, paper towel rolls, or containers