Can a door button be pushed with anything other than a ball?

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In Smash Hit, at the end of each section in a game, a door can be opened by hitting all the blue circle buttons with a ball, as seen in this screenshot:
However, curiosity is getting the better of me. Is it possible to push this switch using anything other than a ball?
Best Answer
In answer to your question... you can not. It has to be with a ball (I tested this) so, no. You are unable to open doors without balls.
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Monty Hall Problem - Numberphile
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