Develop a Sprite and Platform Game - Unity 4 Game Development - page 12

4. At the last step, we will go to SimplePlatform | Resources | Sprites | Level and
click on the Background file inside this folder in the Project view. Then, we will
go to the Inspector view, set it as the following screenshot, and click on Apply :
5. As we can see, this time we set the Sprite Mode to Single . This means that this
file only contains one sprite. Now we have finished the setup part. Next, we will
start building the level.