It wasn’t able to figure at first, but then I got it. It seems I was able go to next level by putting in box each time, without doing anything else, with ring or hat or anything.
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Thank you for playing and for the feedback! Happy that you liked it :D
Being able to go to the next customer by sending the doll without anything is actually intentional. It's one of the ways to "fail", giving you less money and a complaint from your customer.
Glad you figured it out and enjoyed it overall!