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Revision 1 : 
* Software version : 1.00. 
* Japanese release only (94/12/08) (Japan Rent)

Revision 2 : 
* Software version : 2.00. 
* Japanese and Asia releases (94/12/17). 

Revision 3 : 
* Software version : 2.10. 
* Japanese releases only (94/12/19). 

Revision 4 : 
* Software version : 3.00. 
* European and American releases (95/01/05). 
* European and Hispanic releases (95/03/31). 
note : US versions are slightly different, they have the "Recycle It, Don't Trash It!" screen. 

(from Mame history.dat/http://www.arcade-history.com)

Gameplay/Character/Balance tweaks were different in each revision.
Japan Rent/V1.00 has the most differences, as well as a notable bug/design flaw:<br>
-When you press start between a round and hit a fallen opponent, you will gain meter and the opponent will accumulate dizzy stun that carries over to the start of the round.  If you hit the opponent soon after the round starts, even if it's just a light attack, they'll be dizzied.

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