Some games consist of multiple products without a clear core product. In some cases, you need multiple products to be able to play the game. In other cases, there are many different products that function as a stand-alone core set.
For such games, an entry can be created that stands for the game as a whole, and not for a specific product. This allows the discussion on the game to be centralized in a single entry.
The "game system" entry should not have versions, as it does not represent a specific product.
This family is meant to keep track of the game system entries that are in the database.