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my actors don´t appear if they are out of vision.
what should i do?

Um... not sure what you meant by this. If they are out of view, then you shouldn't see them. The view actor acts as a window allowing you to see the actors within its boundaries. If you have actors outside the view, than you don't see them, such as parts of the levels you haven't reached. So if you want to see them, move them into the view or move the view to encompass them... Maybe I didn't understand the question?

i can walk left and right, so i can go to this actor (an enemy).
after posting my first post, i added an actor an put it out of view, too, but i can see this one.
what could be wrong with the actor?

Well, I can't tell for sure, unless you post the ged with its data folder, but you may have set the actor not to appear on startup. You might want to check this, go to the Actor Control Panel, you should see Create at startup, make sure that is set to yes. If that was not the problem it could be due to animation/parenting issues, but I don't think so.

Heres my game
it is my first, so it is quite easy

Okay, what is happening is that your actor is falling through the ground. There are ways to fix this, one is not to use gravity and have absolute placement, which is what most people do. Unless you have a reason to have gravity on the object, meaning it will not just stand there, then simply placing it should be enough. From what I see of the game, it is not required, as it will just stand there. If you do have a reason for gravity on that object, I can post a fix of your game, but I suggest no gravity.

oh, ok, thanks for your help.