What does this game test?
Memorising name-face associations tests associative episodic memory — the brain's ability to bind two pieces of information (a face and a name) into a single retrievable unit. It is a particular form of memory: it depends almost exclusively on the hippocampal structure in the medial temporal lobe, a region known as the first affected in Alzheimer's disease.
The Crook & West 1990 study showed that forgetting the names of recent acquaintances is the most frustrating cognitive problem reported by seniors — more frustrating than forgetting where they put their keys or missing an appointment. It has high ecological validity: what it tests is relevant to everyday life.