Thanks for the reply!
Yes, that's a problem, the mechanics must be the same and the user muyst see equally far at high and low res.
Making sprites and images for all resolutions is not an option.
I think the first option is the best, the game should adapt the images to the user resolution, I'll try that!
May I do another question?
When game developers talk about a render target is something like LPDIRECT3DSURFACE9, Sprite and that sort of things?