Samsung gt-i9505 Handbook page 31

Play games together
Don't play alone − enjoy games
and compete with your friends
instead. Play online games
together with the group play
feature.
To play the games together, tap Group Play > Create
group to create a group. Then tap Play games, and then
select a game to play.
To join a group and play the games together, tap Group
Play > Join group > Play games.
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