The most popular entry is sold separately with online co-op. Often dirt cheap during sales.

Note: This section discusses emulation. Emulation software is legal. You must legally provide your own game files (ROMs) by dumping them from cartridges or hardware you own, or by using ROMs extracted from games you have purchased.

Many hardcore fans prefer emulation because it offers the most accurate arcade experience (CRT filters, scanlines, and zero input lag) and allows you to play the games missing from Steam, like Metal Slug 6 and Metal Slug XX.

Here is the honest, legal roadmap:

| Game | Best Legal PC Source | |------|----------------------| | Metal Slug 1 | ACA NEOGEO (Steam/GOG) | | Metal Slug 2 | ACA NEOGEO (Steam/GOG) | | Metal Slug X | ACA NEOGEO (Steam/GOG) | | Metal Slug 3 | ACA NEOGEO or standalone Steam version | | Metal Slug 4 | ACA NEOGEO (Steam/GOG) | | Metal Slug 5 | ACA NEOGEO (Steam/GOG) | | Metal Slug 6 | Not natively on PC – requires PS2/PSP emulation of Anthology (legal with own disc) | | Metal Slug 7 | Play Metal Slug XX (Steam/GOG) – it’s the definitive version |

Total cost for ACA NEOGEO games: ~$8 each during sales. Metal Slug XX: ~$20, often $5 on sale.