Continuum Shift is the 2nd entry in the BlazBlue franchise, and it arrived exactly 1 year after Calamity Trigger, adding 8 additional characters to the original roster! The tradition of in-depth story modes with alternate paths is being kept, and expanded upon with way more game modes this time!
Character Selection Screen, BlazBlue: Continuum Shift Extend
CS received a lot more developer support and player recognition since its November 2009 release - resulting in two major game upgrades, Continuum Shift II in December 2010, and then Continuum Shift Extend in December 2011, further expanding its roster, balance, and gameplay modes!
Hopefully, you can get your hands on the full Continuum Shift Extend package no matter where you buy it from nowadays, so you will have access to the most complete version!
20 Characters in BlazBlue: Continuum Shift