The Tom Clancy's Rainbow Six website announces closed beta testing of the upcoming Rainbow Six shooter Rainbow Six Siege is being extended through the end of this weekend, and will now conclude on October 4th. Word is: "Not only will this give you all more time play, it will give us more time to collect more data, feedback and identify potential issues." They also note that all players who have participated in at least one closed beta match will be receiving codes in the mail to invite one friend to join the beta on the same platform.