We've received some reports of the client having a problem in windowed mode where the game window is very small on screen and is unable to be enlarged.
Here is how to solve this issue:
1. Press Windows + R on your keyboard
2. Enter "regedit"
3. Go to 'HKEY_CURRENT_USER/Software/Nimbleneuron/Black Survival Eternal Return'
4. Remove the "Screenmanager Resolution Width" and "Screenmanager Resolution Height" entries.
5. Restart the game
If the problem persists, please contact Customer Support.