[pythonaut_16]

> Q: Open-world games are often really buggy, because there’s just so much going on. But I experienced very little of that in my time with Breath of the Wild. How did you pull that off? Was it just a really extensive QA process?

> Dohta: There was another point that we developed during our QA process. We came up with a number of scripts that would basically allow the game to be played automatically, and allow Link to run through various parts of the game automatically. And as that was happening, on the QA side of things, if a bug did appear I’d suddenly get a flood of emails about it. That was one tool that we found to be really handy.

https://www.theverge.com/2017/3/11/14881076/the-legend-of-ze...

Breath of the Wild used a tool to do automated run throughs as part of their bug testing suite. This is just a quote from one interview, but if you do a bit of Googling you can find some good information about their development and planning process.