all at once
All at once
The all at once block is a c-shape block that runs the blocks inside of it as run atomically, like with custom blocks and run without screen refresh. It originates from the Scratch 2.0 alpha block with the same function (the block still is available in 2.0 and 3.0, but it is broken and doesn't show in the block palette), which was replaced with the custom block option.