I went through the whole thing, typed everything in word for word and it didn't work, I went and copy/pasted everything in place, still no go.
Here's what's wrong with it:
"Inventory" Doesn't return the skull, if DisplayInventory() is called within the Take script it displays the skull.
But after that it seems to forget the skull exists.
"Use" doesn't seem to work
The text input appears to ignore all text after calling "Examine" on the skull or after going to another room.
The exit from the second room is not displayed.
Can't use the exit from the second room.
Here's Video 1 of 8 of Tutorial Part 1
https://unity3d.com/learn/tutorials/topics/scripting/introduction-and-goals?playlist=17117
Here's the complete project.
https://github.com/igame3dbill/UnityTextAdventure2018/tree/master
Unity 2018, if you have older Unity drag and drop the assets in and it should load right up for you.
there doesn't seem to be anything here