A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
That's only a warning, it doesn't stop you from running the script. The variable is used later on when sound is added.
So I'm having an issue on getting the walls to break. In the AttemptMove method hitComponent is always null, even when I hit a wall, so I can't...
Not sure what issue you are having specifically, but the code below each video should be good. If you want you can look through the upgrade guide...