ISO. While originally an arcade and PS2 title, Metal Slug 6 was never released as a standalone game for the PSP; instead, it is included as a primary feature of the Metal Slug Anthology collection . Metal Slug Anthology for PPSSPP
Metal Slug 6 runs well natively, but slight tweaks fix visual bugs. metal slug 6 iso ppsspp link
Metal Slug 6 is not available as a standalone ISO for the PSP, as it was never released as a separate title on that platform. To play it on the PPSSPP emulator, you must obtain the ISO for (known as Metal Slug Complete metal slug 6 iso ppsspp link