Samurai Shodown/Secrets

Play as Amakusa (SNES)
At the TAKARA logo, press, , ,. If done correctly, you will hear Amakusa's teleport sound.

Now, at the character selection screen, hold and  simultaneously.

Note: Amakusa can only be played at Vs. and Count Down modes.

Play as Extra Characters (Game Boy/Super Game Boy)
In the intro, when you see Haohmaru hanging the sword and cutting the objects at your side, rapidly, press 3 times, you should hear a chime after you do this code, because the code is one of the most harder to work, if you do these steps, at the character selection screen, Kuroko, Hikyaku, and Amakusa will appear below the 12 normal characters.

Play as Amakusa (Game Gear)
At the TAKARA logo, press SMS Right (Dpad)SMS Right (Dpad)SMS Right (Dpad), a sound will be heard and Amakusa will be selectable at the character select.

Play as Galford's Dog Poppy (Xbox, PS2)
At the character select screen, hold down start and choose Galford.

Play as Galford's Dog Poppy (NeoGeo)
At the character select screen, highlight Galford and enter the following sequence: + (any button)

Enable Red Blood (NeoGeo Home Version)
Go to the Options menu, highlight Exit and press   and   at the same time.