Yep, that's exactly the app I was using before. I only recently noticed that it was no longer in the Play Store -- that can happen if the developer abandons the app. You could try searching other sites for the apk installer file, but that can be a little risky, since malware is more common in those sites. I suggest trying that My Tasks app I mentioned in my previous post -- it works quite well, and is free and without ads. Its widget seems to sync more readily than the widget for that "ice cubes" Tasks app.