There's a Debug Menu  in many titles from the Metal Slug series. Today I played around with that debug menu in Metal Slug X, especially I turned on 'body rect' and 'attack rect', which revealed how the game works. Now not only did I have tons of hours of fun, I also studied a lot from this amazing game!      Of course the following are only my observations, or my best guess on how they have been implemented the game. Although I think my interpretation should work, but it's definitely not the only way, and it's quite possible that the developers have achieved the same effect with another (maybe better) method.     First Impression     At the first glance, the debug drawing is far cleaner than I had  expected, it seems that it's not tiled based physics at all. But note  the thin shadowed area below the line, which may imply that it's still using tiled based  calculation somehow.      Edges     The ground is described as line segments, from the way the ...
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