When I am looking at the workshop items, it is not easy to tell if I have played them before. After I play them, I usually unsubscribe from them, and there have been so many I have played, I can't keep track of them all. The workshop should make it easy to know this as you are searching the various content. For instance, as I was looking at a Collection of maps, it would show me which ones I was subscribed to, but not which ones I had played before.

See this screenshot:
https://ibb.co/DLrdx5y

Under the subscribe button, please add some kind of icon to indicate that the user has played the map before. This icon should also be visible when the user clicks on the page for the Workbook item. This way, it will always be easy for us to tell which workshop items we've already played.