Xperia PLAY :: Its Touchscreen Not Responding

I've a one yr old xperia play. It worked fine until I installed Temple run few days back. My phone would not respond to the touchscreen when I try unlocking it, but it would respond once I slide the joypad, press power button once or twice etc. But after few days, this became worse and now even the Home button became unresponsive.The current situation is that I cannot unlock my phone as the touchscreen is not responding at all.

When this problem started, I had checked the running services to ensure whether there were any malicious programs taking up CPU usage. I could not find any.