Hi manuelah-there is an active thread for Gamecenter for all the games you have listed. Please use this existing thread for your requests.
http://www.ipadforums.net/friend-re...riend-request-zombie-cafe-dragonvale-etc.html

Also,
Welcome to the iPadForum! This forum is loaded with invaluable information which contain topics including: General Discussion of the iPad, iPad Operating System, iPad App Store, Accessories, and Ipad for Business and Education.

The iPadForum also includes a Regional Ipad Group for international users across the world. This is a wonderful area to "find" members from your own country. See here:Regional iPad Groups

If you have not already done so, please take a moment to download the iPad Manual User Guide iOS 5. This is extremely helpful if you are new to the iPad world.
http://manuals.info.apple.com/en_US/ipad_user_guide.pdf

Finally, please take the time to read the Forum Rules:
http://www.ipadforums.net/forum-rules-help-info/2119-forum-rules-everybody-please-read.html

Best Wishes and Enjoy!

And with this, we will close this thread. Thank you for your understanding.