For those who have problem with black screen when clicking CONFIG, please follow these steps:

1) Click on the CONFIG, you will see black screen.

2) Try to find the option FULLSCREEN by hovering your mouse around the lower part of the game screen and then moving up slowly. The lowest clickable option will be QUIT GAME, and next will be SAVE GAME and FULLSCREEN is the next one. If you click on CONFIG from the main title, then just find the FULLSCREEN option. It will be the lowest one.

3) Click on the FULLSCREEN option, you will enter the full screen mode but it's still black screen. Press ESC key and then you will see the CONFIG screen now. The black screen will be gone. But next time you enter the game, you'll have to repeat these steps.

Happy gaming!