With the Game Console you can run commands and view log messages, which you can create easily within your code. It can also log errors and exceptions outside of unity, so that you can quickly view what’s wrong.
It comes with many commands such as scene, or changeoption. You can also create your own commands in C#, which will be automatically added to the list.
Normally when stumbling upon a slight issue you need to fix it and rebuild your entire game. With the Game Console you can continue your session by running a few commands.
You are free to change the layout, sprites and colors of the interface itself, but you are also allowed to change the colors and behaviour via the configuration file.