After you have finished all five Story Paths, and turned the title screen Blue. Highlight the Options menu, and press Start to enter to get two new options: Character Resize and Game Speed. You have to press Start and not any other button to get those two options.
Full Boost
Pause game play and press Up, Up, Down, Down, Left, Right, Left, Right, X, Square, Triangle, Circle.
Listen to the Game's Soundtrack
To listen to the soundtrack of this game, insert the Silhouette Mirage game disc into an audio CD player and select Track two.
Super Core Fighter II
After you have finished all five Story Paths, and turned the title screen Blue, the Status option will turn to Secret. This is a one on one minigame with Shyna and Zohar fighting each other.
The secret Reaper boss fight
Exclusive to the PS1 version is a secret battle with the Reaper. To reach him, all you have to do is reach the end of Stage five without using a continue. If done right, instead of going to Stage 6, you'll be transported to an alternate dimension where you will be asked three questions.
You need to answer the following way:
1) No, why?
2) Of course not!
3) Yes, I do!.
If you answer anything else, you'll be kicked out. If you answer correctly, you'll fight Reaper. The game continues normally after that.
Extra Options...