Apple iPad iOS 4.2 - Manual (Page 123)

Achievements
Some games reward you with bonus points for specific achievements.
See the possible achievements for a game: Tap Games, choose a game, then tap
Achievements.
For each achievement, Game Center shows how many bonus points are awarded,
and whether you’ve completed the achievement. The total points awarded for your
achievements appear at the top. You can get bonus points for a specific achievement
only once.
You may also be able to view achievements from within a game.
Recently Played
Some games let you see which of your friends have recently played the game.
See who’s recently played a game: Tap Games, tap a game, then tap Recently Played.
Get information about a player: Tap a player’s name in the list.
Friends
Game Center puts you in contact with players around the world. You add friends to
Game Center by making a request, or by accepting a request from another player.
Add a friend to Game Center:
1 Tap Friends or Requests.
2 Tap +, then enter a friend’s email address or Game Center nickname.
Matching addresses and names from your contacts appear as you type. Tap a contact
to include that person in your request. Tap to browse your contacts.
To add several friends at once, enter additional contacts.
3 Enter a message for your request, then tap Send.
To become a friend, a person must accept your request.
Other players might send you a request. If you receive an alert, you can accept the
request from there, or close it and respond to the request later from the Request screen.
A badge on the Requests button displays the number of outstanding friend requests.
Respond to a friend request: Tap Requests, tap the name of the person making the
request, then tap Accept, Ignore, or Report a Problem.
When a player accepts another player’s request, they each become the other’s friend.
Friends’ names appear on the Friends screen.
Get information about a friend: Tap the friend’s name.
Search for a friend: Tap the status bar to scroll to the top of the screen, then tap the
search field and start typing. Friends who match your search appear as you type.
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