This problem arose installing the Games module, but I doubt that it is peculiar to it.
In the Plugins Check page, it says that games is to be installed.
As the picture from the Plugins Overview page shows, I have installed it and into the right place (at last) but now what? It does not show up in the list of activities.
This is not the first module or filter or block that I have installed, although it has been some time.
Any advice welcome