The map darken's sometimes when playing?

Not sure what you mean by darkening.  Note that if you're playing an Empire faction and your influence spreads, the land around will change to a darker, somewhat blue, hue.  Or do you mean something that applies globally, e.g. even over menus & dialogues, etc.?

it's a global thing.

Hrm...if you're playing on a laptop, make sure that it doesn't have any kind of auto-brightness adjustment enabled.  Other than that, I believe Primal_Savage responded in your support forum thread with some settings to try.

Good luck!

How would i check that?

N/A

I encourage you to try Primal's suggestion first, but if it doesn't help and you want to check if it's auto-brightness adjust, you'll need to determine your laptop manufacturer's instructions for disabling auto-brightness adjustment.  As a for instance, here's some instructions for a VAIO computer:

http://forum.notebookreview.com/sony/716567-guide-how-disable-auto-brightness-auto-contrast.html

...with a mix of some general and Sony/VAIO specific information.  However, you'll need to research your particular machine for specifics.

Note that if it *is* this feature, it would affect all applications, not just Legendary Heroes.

Actually the game is running really good, but sometime's the screen darkens for some reason, but other than that it my only problem now, so it has really been improved, the support team also said that my spec's and graphics should be able to run the game.