Scratch

I used this method with my "Spatter" Project.

If you want to get a good screenshot of your game, you put this script in any of your sprites.

<when[ Space ]key pressed>
<stop all>

This works very well with games that involve a pen. You dont want to see a line going up from  the middle of the screen in the screenshot, do you?

Dont forget to delete the script when shareing it!