I need help to add hacked mame roms

[EL REY BUGE]

Hi i'm trying to add Mortal Kombat 2+ and Ultimate Mortal Kombat 3+ (the plus hacked versions) but they don't appear when adding the roms can somebody help me please? 

[JoeViking245]

2 possible options for adding individual games are:

1. Drag and drop the ROM files onto the LaunchBox UI (follow the prompts)
2. Click Tools, Import, Manually Add Game (you'll need to do this for each game)