Chaos;Head Dual will be rated CERO Z, which is essentially an adults only rating in Japan. The reason for the stricter rating is Chaos;Head Noah.
There are two versions of the visual novel, a CERO Z release and a CERO D version. While Chaos;Head Noah has been released for multiple consoles, the CERO Z version is only available on Xbox 360. The PS3 and PSP ports were edited for a CERO D rating.
Chaos;Head Dual will cost 5,800 yen in stores. 5pb will also sell Chaos;Head Noah for Vita and Chaos;Head Love Chu Chu as separate games on PlayStation Network for 3,000 yen a piece.