Substracting from a variable

[nf67]

Hi there,

Is there an easy way to substract from a variable?

I am creating a little game in which you have 3 lives, I need to substract 1 every time a certain thing happens that should make you lose one.

I tried the following:

$Lives = 3

(...)
if (certain thing happens) then

$Lives-1

(...)

If $Lives = 0 Then
MsgBox ( 0, "Game Over", "Game Over" )

Now my problem is that "$Lives-1" doesn't seem to be a valid command

Any help is much appreaciated.

P.S: I cna also post my full code, but I'd rather keep the forum clean and thought this would do.

[Zedna]

$Lives=$Lives-1

or

$Lives-=1

[nf67]

Thank you, Zedna