This is a way to Pause all the code in your game. Click on the green flag to begin or reset. Use Space Key to pause the game. Hit Space Key a second time to unpause the game.
I figured this out on my own. It is a MabonBaladevaKain original script. This is opposite to every other Stop script out there because it sets the timer to zero when it is stopped and starts the timer when it is not. Most do the reverse.
