Play as Amakusa Shiro Tokisada (Samurai Shodown 1)
     Beat Story Mode using any character and save the game. Now on the
Character  Selection  screen, enter Versus Mode, highlight the ?, then
hold L1 + L2 + R1 + R2 and press Start.

Bonus Options (Samurai Shodown 1)
     Beat Story Mode using any character and save the game. Now on the
Main  Menu,  enter  Versus  Mode. Highlight the Option selection, then
hold L1 + L2 + R1 + R2 and press Start.

Play as Kuroko or Mizuki (Samurai Shodown 2)
     Select Versus Mode, then at the Character Selection screen, press
L1  + L2 + R1 + R2. Move to the right to play as Mizuki or to the left
to play as Kuroko.