Add004

Add004 is a program in which have many features, ''predominantly known for it's tag system. Add004 is also patch system similiar to uno tag where it not only provide you with a screenpack, but also gives you the chance to make mugen even closer to that of a commercial 2D tournament fighter, most characters in mugen are compatible with this system but some are not or may lack some things like a assist.''

Gameplay
''This patch system gives you a generally new style when it comes to terms of normal gameplay. Add004 gives characters a more optimized way of fighting, one of the changes that add004 gives to a character is there own mechanics, now they can parry and red parry like in Street Fighter III 3rd Strike/Capcom Vs SNK 2.'' 

Add004 also makes characters have a tag system which means a assist and change partners with other patched characters, and gives them a new lifebar along with a extended meter system, depending on what mode you choose in mugen you can either get your normal level 1's through level 5 or a max meter in blue which seems to deal more damage and allows you to blue parry while the red goes from 50% to maximum, the red maximum meter allows you to red parry which slightly heals you and also do a lot of hypers. You can parry and red parry by going to the direction that the opponent is going to attack you therefore executing the parry. The only missing features that add004 lacks is duo hypers which you have to indivually code in the chars cmd. There are also a guard break mechanic to insure that the character can't guard forever, with the exception of add004 Bs0 which doesn't have that feature, There are also 3 different versions of add004 which only differences are the lifebars, with the exception of Bs0 which lacks the parry system.