if i use for example this code:
when flag clicked
forever
if variable = number then
start sound

then it makes that sound forever and i want 1 time. How to fix that?

Here's how you fix that:

when green flag clicked
forever
if <(my variable) = [1]> then
play sound [meow] until done
wait until <not <(my variable) = [1]>>
end

You need it it wait into your variable isn't 1 so it doesn't loop, and when it zero it will reset and wait for it to be one agin to play the sound.

wait until <not <[variable] = [1]>>

is a helpful peace of code I use a lot
Hope that helped, have a nice day !

Or, if you want the rest of the code in the forever loop to run without waiting on the sound:

forever
...
if <(my variable) = [1]> then
play sound [ v]
set [my variable v] to [some value that isn't 1]
end
...
end

note: the grey blocks represent any other code in your loop, I put them there as placeholders for whatever you put there.

thanks everyone! now i understand @ChompyChompee @BigNate469

hi