Black Hole is a joke of doubtful taste, to spend any enemy you have. It is a tangle that simulates the action of a large black hole in space. It is totally free and does not even require installation.
The function of Black Hole is to show a small grayish spot in the center of the screen. Little by little, that stain will grow more and more, until it ends up completely hiding the Desk. In this way, it scares those who are seeing it, because it cannot do anything to prevent it.
In addition, to make it even more unsettling, Black Hole disables the option Ctrl + Alt + Delete, so the only way to regain normality will be to restart the computer abruptly with a reset.
You can free download Black Hole 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.