Rating: 4.3/5
Metal Slug Complete (released internationally as Metal Slug Anthology) is a collection of the first 6 Metal Slug games of the series (including X). It's a good collection, the only problem is that the games are actually emulated and not ports, so loading times can be a bit annoying.
You also need an emulator to run this game. To grab one quickly, please check out our PSP emulators section.