Hi, Sabine,
when I first saw your desired design with the 56 buttons I was a bit shocked.
My thought was "Why does she bother the respondents with this confusing and exaggerated design, just to select one button".
Two single punch questions (dag and tijd) would have been sufficient
And if you - for some reasons - would like to have a code from 1-56, this can be handled easily by an equation.
And now the multipunch option. The array(numbers) is the adequate type of question here.
As far as I know our wizard Tony, he might be able to switch the checkboxes to buttons.
Something like this:
Best regards
Joffm