Wait a second. I have created and written several published sandboxes for Mutant Year Zero. And YOU explain the concept to ME?! I was nice and I gave you a chance, but you didn’t take it.
Of course, I could explain things all over again (what the sandbox concept previously has been in the Year Zero line etc.). In the Alien RPG another concept has been used. A sandbox is there a more vague concept (only mentioned on the back of the cover). Several other than me has pointed out that the campaign concept in the basic rule set is kind of vague. I think the problem is that several core questions remain unanswered. What is a sandbox in this particular game (not in other games)? In what ways can the Alien mythos be used for creating campaigns? I know that there are a lot of creatures in the book, but that’s not a campaign concept. What does corporate power mean from a game point of view? Questions like that. I get that a creative GM could come up with great answers him or herself. But the game should, I think, be more supporting, offering better tools. If I should make a not very wild guess, the crew behind the game ran out of time or pages or both. And there will be supplements. When you create an RPG, it’s not allways obvious what should be included in the basic rule set. The making and editing of the actual pages might be a decisive factor.
I could explain this to you over and over, but I’m sure you would ignore it. Maybe it’s a cultural thing. In most or all European countries it’s still quite important to be polite, and respect the work of others. I don’t think you are able to understand that. Over and out.