iPhone 5C : Game Center little square/app disappeared! Help.

I just bought the iPhone 5 C and I installed the newest update and then I saw the apps that it came with, including the Game Center. As I was arranging the apps on the main screen, Game Center completely disappeared from it. I cannot find the Game Center unless I type "Game Center" on the app-search-bar. I already checked on the secondary and third screen to the right of the main screen, and the Game Center for sure isn't there. What happened? Any idea on how to put it back on the main screen would be helpful! I already tried to check under "Settings-General-Restrictions" but that didn't work. Thanks.