I'd like to ask you about light and shadow. When I create my map, it is full lighting, but I want to make it more darker. Can you tell me how?

Have you placed any light entity into your map? because in the case you didn't, the engine automatically set a parameter called mat_fullbright to "1" in order to show your map... If you have added lighting to your map, then enable the developer console and type mat_fullbright 0

This big amazing guide to lighting should help you out. http://www.tophattwaffle.com/lighting-tips-tricks-and-hints/

TopHATTwaffle wrote:
This big amazing guide to lighting should help you out. http://www.tophattwaffle.com/lighting-tips-tricks-and-hints/