Dataset 006 is deliberately simple, Video Games and their sales. While there is no Date dimension to it, there is capability of looking at sales by release years, platform usage, Min and Max of reviews and sales across publisher and developer. It will give a real solid grounding of how DAX fits into Power BI.
I hope you can already see that Dataset 007 will have to be a date-based dataset so we can do lots of Time Intelligence.
Download the dataset
https://www.kaggle.com/xtyscut/video-games-sales-as-at-22-dec-2016csv
