Highlight object when clicked during a presentation

I am trying to create a jeopardy like game with keynote. I can easily create links to slides with the relative question and answer. But when I go back to the main slide with the board, I would like the cells on the board to disappear or to change color or to change in any other way, so that I know which questions have already been asked.

To simplify the problem, let's say that I have a circle and a square on my slide. Is there a way to make them change or disappear depending on the order I click them while I am playing the slideshow? If I click on the circle, the circle disappears, and if I click the square, the square does. Without following the order in the build order.