This is the most common way to access the game. The ISO typically includes Metal Slug 1, 2, X, 3, 4, 5, and 6. PS1 ISO Conversion:
Released in 1999, Metal Slug X is an upgraded version of Metal Slug 2 . SNK developed this "special edition" to fix the slowdown issues prevalent in the second game while adding a wealth of new content. It features: metal slug x ps2 iso
These versions are direct emulations of the original Neo Geo MVS arcade hardware. This is the most common way to access the game
Changed enemy placements, different times of day for stages, and new boss patterns. different times of day for stages