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MAME 0.139u1 uses a strict parent/clone system.
If mslug3.zip fails, ensure mslug.zip (Metal Slug 1) is not required as a parent. In 0.139u1, Metal Slug 3 was still a standalone clone of mslug. mame 0139u1 roms list
You might wonder, "Why not just use MAME 0.260?" MAME 0
Between MAME 0.100 and 0.162, the MAME team released "U" updates frequently (sometimes daily). These were bleeding-edge builds. 0.139u1 specifically was released in March 2010. If mslug3
Understanding the versioning is critical. MAME uses a semantic versioning system:
| ROM Name | Game Title | Manufacturer | Year |
| :--- | :--- | :--- | :--- |
| pacman | Pac-Man | Namco | 1980 |
| mspacman | Ms. Pac-Man | Midway | 1981 |
| dkong | Donkey Kong | Nintendo | 1981 |
| galaga | Galaga | Namco | 1981 |
| frogger | Frogger | Konami | 1981 |
| 1942 | 1942 | Capcom | 1984 |
| bublbobl | Bubble Bobble | Taito | 1986 |
| robotron | Robotron: 2084 | Williams | 1982 |