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Scratch Loops
If you ever need something to REPEAT, then the chances are, you'll need a loop. There are different types of loops in scratch and it will be a matter of finding the right block for what you need.
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More on Loops
The Repeat Until () block is a Control block and a C block. Blocks held inside this block will loop until the specified boolean statement is true, in which case the code beneath the block (if any) will execute. This loop is in similar nature to a while loop in some other programming languages.