4Gamer.net ― [E3 2011]基本プレイ無料型のMMOストラテジー「Prime World」,ガチに戦うだけでなく王国作りに専念もOK(Prime World)
http://www.4gamer.net/games/135/G013520/20110611010/
関連情報
E3 2011: Nival announces Facebook-integrated MMO Prime World | Massively
http://massively.joystiq.com/2011/06/07/e3-2011-nival-announces-facebook-integrated-mmo-prime-world/