The "challenge" feature gives you the ability to personally invite a player to a duel. When you challenge someone, they will automatically receive your invitation via E-mail.
2. How do I challenge another player?
There are three ways:
Click one of the buttons that are on the right-hand side of both the homepage and the duel selection page that say "Challenge Player."
Click on the username of the player that you would like to challenge. There is a "Challenge Player," link on each member's profile.
Click on the "My GameDuell" tab and then on "My Friends." From here you can challenge your friends.
3. Can I challenge someone that isn't yet a member of GameDuell?
No, you can only challenge GameDuell members.
4. Can I challenge players of higher and lower skill levels?
Yes, when you challenge a player, the skill levels of the duel opponents are not taken into consideration because both players have to willingly accept the invitation. This offers you a chance to test your expertise against those of players with higher skill levels.