Game in Game Center not being deleted even when I choose to remove it upon its deletion. iPhone 3G

Hi? I have problem deleting a game in the game list of my Game Center.

To be more specific, I have trouble deleting "Fruit Ninja" from my Game Center.

Yes, I did choose "Remove from Game Center", when I was prompted during its deletion, but it not being removed.

And yes, I did reinstall the game, played a bit (more than 10 minutes), and then deleted the game, but it didn't help either.

How do I remove this particular game from Game Center?

All other games are removed properly, but just this one has a problem.

And friends of mine has the very same game, and it is removed correctly when chosen to remove it from Game Center.

I believe it would be really great if I can just reset my Game Center account, but I don't know how to.

Can anyone help me resolve my problem?

Thanks!