The floor is Lava!
Create a game level where a ball can't touch the floor.
1. The ball must have physics applied to it
2. You must not let you ball touch the floor
3. The ball must travel across your level so that it touches 2 corners of your scene
4. Everything must be textured.
5. The structures in your scene that you ball rolls around on must spell your name.
Update you Learn.Unity.com account
Go to https://learn.unity.com/ and update you account.
The video below shows exactly what everything should look like.