Hi, guys! 
I’m a absolute beginner with Unity. I liked a lot the tutorial games (Roll-a-ball, Space Shooter, Survival Shooter, Tanks, 2D Roguelike, 2D Ufo and Adventure Game), and I believe they’ll be very useful to me.
To a better learning I just would like to know: which order I should use them, from first (easiest) to last (least easy)?
There’s anything unclear on my question?
I think the question is clear, but there is no clear answer.
Pick any beginner-level tutorial, and dig in!
You mean, there’s no rule? I saw that there’s difference between beginner and intermediate, so I thought the level difference would be sensible enough to make a certain order.
Nope, there’s no particular order. Each tutorial is more or less independent. But they do try to roughly separate them into beginner, intermediate, etc., so just browse the beginner tutorials, pick one that looks like fun, and dive in.
Be sure to follow along on your own computer. Sometimes people try to just watch the tutorials, without actually doing them, but that isn’t anywhere near as effective.