I downloaded this app at the beginning of the year due to getting older and feeling the need to exercise my brain. I was diagnosed in April and have zero memory of March & April, but I took it back up in May. My short-term memory has improved immensely. I can't recommend it enough. You will get inundated w/ emails offering discounts on an upgrade, but Androids don't support the upgrade and I only want to do it on my phone....that way, I won't miss a day.