Which memory test should you try first?
The Visual Memory Test, Digit Span or Sequence Memory. Each adds one more item at every level, so your result is simply how far you got. The N-Back Test works differently: instead of a growing list, you compare each new item with the one 1, 2 or 3 steps back, holding and updating at the same time; the Dual N-Back Test does it for a square and a spoken letter at once. The Operation Span Test measures how much you hold while doing something else: sums between the letters. The Spatial Memory asks you to keep track of places as you search: which boxes you have opened, and which have already given up a token.
The other games test recognition and recall: whether you have seen a face or a word before, where an object was, or exactly what color you were shown. The Delayed Match-to-Sample Test makes you wait before you choose, so its score at each wait shows how fast a picture fades.
Is this a memory test for dementia?
No. These are games, not medical or clinical memory assessments, and no score here can point to dementia or any other condition. Your device, your attention on the day and how often you have played all change the result. If you or someone close to you is worried about memory, talk to a doctor.
What is a good score on a memory test?
It depends on the test, so each page answers that for itself. Where someone has published a typical result for a test built like ours, the page quotes it and links the source; where nobody has, the page says so rather than invent an average. The fairest comparison is with your own earlier tries on the same device.