I don't know anything about D2D but I can tell you that the first and maybe the second are the only ones worth getting and the game is rather dated and has some qwerks/bugs that are quite annoying like not being able to load during a mission forcing you to quit before loading, that gets annoying if you are getting slaughtered by mutons. also their is a learning curve that may put you off if you are easily discouraged. But once you get into it can be a very rewording experience.
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