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I'm unfamiliar with eclipse and can't really help you. The issue is probably that it can't find the libGDX dependencies. If you use IntelliJ Idea, it should be able to open the project and figure it out. If IntelliJ is not an option, I'd look into importing the gradle scripts, because that'll probably help. Unfortunately, I haven't really used Java in awhile, so I don't think I'll be able to help you much more than that.