After the urns have been shuffled, each participant has to choose between the two urns.
When a participant chooses once between the urns, 1 marble of the chosen urn will be randomly drawn,
and each time a marble is drawn, it is returned to the urn before the next marble is drawn.
The colour of the marble that has been drawn from your chosen urn is revealed before the marble is put back into the urn.
Depending on the colour of the drawn marble, participants can earn points.
After the colour of the drawn marble has been revealed, the colour is hidden again, and the marble is put back into the urn.