Quote: "How can I make full dark level with only some lights?"
Method 1: Testing Your Game Method
1. Place some lights in your level (not too many!) and save it
2. Test your level
3. When testing, press the "<" key to lower the ambient lighting. You can also use the ">" to up the ambient lighting.
4. Press "Enter" to save that setting for your level
Method 2: Adjusting the Global Settings Method
1. Place some lights in your level (not too many!) and save it
2. Click "File" -- "Build Game". This will pop up the Build Game window
3. Click the "Level Settings" tab
4. Under the "Global Script" line click the "Edit" button. This will pop up the Setup Wizard
5. Locate "Ambience Level" and change it from "25" to "3" and press "Enter" to save it
6. Press "OK" to exit Setup Wizard, then press "OK" to exit Build Game window
7. Test your game
Cheers