Chain Meter:
Press Z during game-play to display a Chain Meter under the Chain Status.
Additional Credits:
To get additional credits accumulate at least 3 or 4 hours of total
game-play. Once you have accumulated 6 hours you should have about 9 credits from the start.
Gallery 1 Option:
Without using any continues successfully complete Trial mode to unlock the Gallery 1 option at the Appendix menu or accumulate at least 5 hours of total game-play.
Gallery 2 Option:
Complete the game successfully in any difficulty setting to unlock the
Gallery 2 option at the Appendix menu or accumulate at least 10 hours of total game-play.