That black scene is the program. You see, the game you see on the site is a scenario created to run on the Green Machine engine. What you've downloaded is the full engine itself. The screen turns black because it doesn't have a scenario to run. The maker of Green Machine said he would put the sample scenario on the site for free download, but he doesn't have the server space & bandwidth (the sample game is 200+ MB). So as it is, the only real way to make the engine useable is to order the demo game from the guy and use its files as templates for your own game. Essentially, you have to figure out how the engine accesses the game files for yourself. It is not a creation kit like CS. Essentially, you make and insert your graphics, and then use these text files to set the parameters for characters, weapons, items, etc. Unfortunately, there isn't a tutorial on how to do that right now, so you pretty much have to get the sample game and reverse-engineer it. I talked to the guy who is making the engine, and it is very much a work in progress. He is still adding all kinds of new features to the engine, and he is trying to get a tutorial writen about how to create game scenarios without having to reverse-engineer the sample. But, it's just one guy working alone, so there's only so much he can do at a time.
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