Metal Slug X
released on Jan 19, 1999
An expanded game of Metal Slug 2
An upgraded version of Metal Slug 2 (Metal Slug 2: Super Vehicle-001/I), titled Metal Slug X, was released in March 1999 for the Neo Geo MVS. It fixed slowdown problems from the original game, and increased the difficulty. Metal Slug X also introduced some new elements to the game system.
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Played this not long after playing Metal Slug 2 to compare. To be honest, this is basically just the "definitive" version of Metal Slug 2. The only two differences I could spot were the much improved optimization (less slow downs and such) and maybe a few different enemy placements and entries that were slightly improved over 2.
That said, this is a great, classic run and gun game. Beautiful sprites and animations on some very impressive for the time hardware, and made by some of the most talented sprite artists ever.
2nd game doin good. I enjoy how the games tell a story through the stages. Not many run & guns do that.