It was a great game! – MetalStorm: Online Review

I have been playing this game for several years and I really enjoyed this game until recently. When I try to play this game now, I am being asked to sign in to Game Center. When I go to the App Store and key in Game Center, it gives me a list of game, but, no Game Center. How can I play if I cannot even get the Game Center?
Review by Mr JRC on MetalStorm: Online.