Guilty Gear X - Platform: Dreamcast

Testament 
---------
Get to level 20 in survival mode and Testament will 
appear and challenge you. Defeat Testament to unlock 
him as a selectable character. 

Dizzy 
-----
Get to level 30 in survival mode and Dizzy will appear 
and challenge you. Defeat Dizzy to unlock her as a 
selectable character. 

Guilty Gear mode 
----------------
Get to level 100 in survival mode or successfully 
complete the game using every character. 

Alternate costumes 
------------------
Highlight a fighter at the character selection screen. 
Press Start, Select, or A + X, or B + Y for more costume 
colors. 

Ending sequences 
----------------
Successfully complete arcade mode to unlock the 
corresponding character's ending sequence. 

Soundtrack 
----------
Place the small bonus disc in an audio CD player that 
features a tray capable of playing a CD single disc. 
Play track two and above to hear music from the game. 

Hidden artwork 
--------------
Place the small bonus disc in a PC compatible CD-ROM that 
features a tray capable of playing a CD single disc. Two 
images from the game can be found in the "extra" folder.