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because MAME 0.139u1 does not fully support the original hardware's 3D-assisted rendering. Setup Requirements for MAME 0.139u1
Most people running MS6 on MAME 0.139u1 are actually playing a bootleg hack . This is often a modified version of Metal Slug 3
Most users running "Metal Slug 6" on MAME 0.139u1 are actually using a bootleg/hack .
Whether you are revisiting the game to finally beat it on one credit or experiencing the Alien menace for the first time, grab your portable setup, plug in your controller, and get ready to burn some ammo.
Please support the official release of Metal Slug Tactics and Metal Slug collections when available. Use this guide to preserve a piece of arcade history, not to pirate modern compilations.
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