Made in December 1994 but never released to the public. Dan-Ku-Ga is an updated prototype version of "Kaiser Knuckle
Here are the known differences:
Before your game, you choose the difficulty level Normal, Professional, or Training.
At the character selection screen : Kazuya, Lihua and Liza have been redesigned, all others have different costume colors.
Gonzales and Azteca are playable.
The 5th opponent is Gonzales, the 9th opponent is Azteca and the 10th opponent is your Doppelganger.
The CPU AI has been altered somewhat.
You can backdash with all characters.
You can't select the first opponent in 1P vs. CPU mode, except training.
A medic comes out to check on the defeated opponent after the final round.