Metal Slug 6 allows you to carry two weapons. The older, "worse" ROMs would sometimes delete your secondary weapon when entering a vehicle. The 01.39u1 specific dump handles the memory pointer correctly 100% of the time.
The "better" in our keyword refers to . For a casual playthrough or a speedrun, the 0.139u1 driver is objectively superior. metal slug 6 mame 0139u1 rom better
Unlocking the Metal Slug 6 Experience: Why the MAME 0.139u1 ROM is Your Best Bet If you’ve ever tried running Metal Slug 6 Metal Slug 6 allows you to carry two weapons