English: From the Sensing category, drag "touching …" and place it in the condition area of the "repeat until … " block. Select "edge" from the drop-down list of the "touching …" condition.
From the Raspberry Pi maths quiz tutorial. Recreated for Scratch 3.
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Captions
From the '''Sensing''' category, drag "touching …" and place it in the condition area of the "repeat until … " block. Select "edge" from the drop-down list of the "touching …" condition.