"Assemble Drill" is a mobile game where players must first design and build their own drilling machine, and then race it through underground tunnels. With a variety of customization options, players can create a drilling machine that suits their racing style and preferences.

Once their machine is ready, players compete in high-speed races against other drilling machines, navigating through twisting tunnels, dodging obstacles, and collecting power-ups to gain an advantage. The ultimate goal is to cross the finish line first and emerge victorious as the top underground racer.

With challenging gameplay and immersive graphics, "Underground Racing" offers a unique twist on traditional racing games, giving players the opportunity to explore the depths of the earth and push their skills to the limit in high-stakes racing competitions.