What is the fine-grained topic of the following text: New problem solving skills were developed in this project when tackling practical issues such as i) how to mix the recording so that the text is audible when being listened to through headphones in the busy, traffic-heavy streets of Helsinki, ii) how to prevent the mp3 player batteries from draining instantly in the minus 25 temperatures of the streets of Helsinki in winter, and iii) how to convince potential audience members it’s definitely a good idea to come and watch a theatre performance based on death located in the minus 25 streets of Helsinki in winter. Only return the topic.
Problem-solving in a theater project amidst Helsinki's winter conditions