We can create balls which roll down the slopes on either side of the course.
Create a new scene with RigidBody3D as root
Add a MeshInstance3D and CollisionShape3D as children
Add a script to the Ball node
For the MeshInstance3D add a SphereMesh
Add a material if you wish
Add a variable to track the start position
Add to the interactable group
In case we want to change color later
If the ball rolls off the edge
In the reset ball function
We can now place balls on the slopes to roll into the obstacle course when the game starts
CONGRATULATIONS ON COMPLETING THE TUTORIAL!