How do dark map hackers set the weather to rain?

It's simple. The script code is preceded by a//statement. This line has been annotated, indicating that this line is not good.

If this line of code is valid, please delete//.

Compare your first line with your second line. Is there a//in the second line and not in the first line?

So if you press 7, it will work and 8 won't.

Remove the//in the second line, reload maphack, and press 8.