you can not add modes to mugen itself. for a tournament mode, your best bet is Windows Mugen Configurator, a MUGEN front end that uses mugen to make a kind of tounament mode.


as for a story mode... its doable. complex but doable.


It will be very basic, but you can "turn" Arcade or Team arcade into a basic Story mode/Beat 'em up mode.

first, you code all the stages from the story mode as a invisible character. use helpers to create the enemies and what not.
(you can code an actual stage to do the stages, but all interaction and enemies should be on the "character" part of it).

them you use orders and the "unselectable characters" trick on the select screen to make them only appear on arcade mode and being chosen by the CPU.


if you want to keep a arcade mode, i suggest transforming "Arcade mode" into "Story mode" and using Team Arcade for regular arcade mode (since it allows single Vs single fights). them use some orders for "Story" and others for "Arcade", so you don't have the "stages" showing up on regular arcade play.

as I said, its doable. but since it is quite a work, many few people do it outside of a fullgame project.