Is there a way to set answer to 0?
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You can't change the answer value, but you can create a variable, set it to the answer value, and then set the variable to 0 when you need to.
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The answer block isn't really a variable though. It changes, but only depending on what the user enters. You could try this though:
When green flag clicked
Repeat until answer=0
Ask '[Question]' and wait
End repeat until
This will only execute the next blocks once the answer is 0.
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