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 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.
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
- Main article: 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.
In Scratch 1.4 and the online Java player, by broadcasting
scratch-startclicked the flag was activated, meaning a project can start if a sprite is clicked.
Conversely, a broadcast received block Hat Block with the broadcast
scratch-startclicked activates when the green flag is pressed.
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.
- http://scratchforums.blob8108.net/forums/viewtopic.php?id=57153 Known Limitation 3