Battle Sabers

Two extra parts:

At the part selection screen enter the following code
R2, L2, R1, L1, R2, L2, R1, L1, R2, L2, R1, L1.

Enable Baiko and Tamasaburo:

At the character select screen enter the following code
L1, R1, L2, R2, L1, R1, L2, R2, L1, R1, L2, R2.