Eng:Green Flag



The Green Flag is a programming feature that, when clicked, will start all scripts in that project that are hatted with the When Green Flag Clicked block. More simply, this block starts the project. Offline, pressing the enter key on a keyboard will also start all green flag scripts, when not prompted for input by the Ask and wait block. Also, when shift clicking the green flag, Turbo Mode will be activated.

Importance
Without the flag, no Scratch projects would be able to run unless a key was pressed, a sprite was clicked, or a When is Greater Than  hat block was triggered to activate the scripts. While creating a project is fully possible without the flag, it is not recommended and many users do so.

Examples of projects which do not use the Green Flag block are:
 * Projects which just share an image
 * Slide shows where only key presses need to be used to move the images

Stop Sign
The Stop Sign is the opposite of the flag; a project will end and fully stop all scripts when it is clicked or the Stop block is used with the "all" option.

History
In Scratch 1.4 and the online Java player, by broadcasting  the flag was activated, meaning a project can start if a sprite is clicked.

Conversely, a broadcast received block Hat Block with the broadcast  activates when the green flag is pressed.

As it was never a planned feature, it does not function with Scratch 2.0, and the Scratch Team does not plan on adding it to these versions.

Icon
In older versions of Scratch 2.0, the Green Flag icon could be placed into custom blocks and variables by adding the text "@greenFlag" to the custom block name.



A similar trick could be done with the stop sign by adding the text "@stop" to a custom block.