Go to the folder where you have the Mugen game and open the Stages folder.
Find the stage folder or stage files you want to remove and delete them.
Some stages may have similar names, so make sure you have chosen the correct ones.
In this example, we’ll delete the named stage “Frasco_GGI”.
Let’s go back to the Mugen main directory, find a folder named “data” and open it.
Inside the data folder, find the “select.def” file and open it with Notepad.
( For Windows XP, Vista, 7: start menu/all programs/accessories/notepad )
( For Windows 8, 10, start menu and type “notepad” inside the search box )
Find the stage on the list and delete it. Save the file and run the game.
If you did well, the game should run without the stage.