How to restart the exercise?

Hi,

I made a little exercise with 9 items en 2 drop targets. The feedback should appear at the end, after pressing the submit button. Until there everything works fine. So then I want two options. Or everyhting was correct, so a layer appears with congratulations. Or there were some mistakes, in this case a layer appears with that message and a button to restart the exercise. Now there comes my problem. I set a trigger, if user clicks try again button, jump to the slide before the exercise (with the explanation). If I test it. I'm send back to the explanation slide as I want but then when I press start to start the exercise, I don't get my drag and drop items anymore. I only see my submit button. So I'm not able to restart the exercise. I'm not sure what I'm doing wrong. Someone has tips?

Best regards,

Inge