G4BOX announced today that players in the closed beta test for its military online shooter game Cross Fire will now be able to take advantage of a new feature that allows them to invite their friends into the exclusive beta. This new feature allows all registered players to send ten beta invitations to their friends. Once an invitation is received by a player's friend, they simply must register a Cross Fire account with that same email to be automatically added to the game without any need for a closed beta key. The closed beta test will run through early December.