All versions of a game (parent and clones) are packed into a single ZIP file. A "set and forget" approach for those with ample storage. How to Use MAME 0.72 ROMs MAME ROM Compatibility | Recalbox Forum

When searching for this specific set, you will encounter three primary formats, each serving a different organizational purpose: Description

Every ZIP file contains all the files needed for that specific game.

: It is particularly famous for running Midway titles like Mortal Kombat II , UMK3 , and NBA Jam at 60 FPS with full sound on devices like the Nintendo Switch . Types of ROM Sets for 0.72

: MAME 0.72 is the base for several key ports, including MAME-NX for the Nintendo Switch and legacy ports for the Xbox 360 .

Users who only want a few specific games without downloading a full library.

Clones (variants of a game) depend on a "Parent" ROM. The clone ZIP only contains files that differ from the parent.

Most users; it saves space while keeping the library manageable.

: This version was developed before MAME shifted toward a more resource-heavy "accuracy-first" philosophy. Consequently, it runs classic games at full speed on hardware where newer versions might lag.