Phantasy Star 0 also known in Australia and Europe as Phantasy Star: ZERO and sometimes in North America as Phantasy Star Ø is a Nintendo DS game in the Phantasy Star series developed by Sonic Team and published by Sega. The game was released in Japan on December 25 2008; in North America on November 10 2009; and in Europe on February 12 2010. The game expands on the gameplay mechanics of Phantasy Star Online partly by borrowing some elements from fellow online Phantasy Star title Phantasy Star Universe such as a fully realized story mode for offline play.