Three kinds of memory
Visual memory holds what you see, such as where cards lie. Working memory keeps a few pieces of information in mind while you reason, like the clues from your last tries. Vocabulary memory lets you find the right word at the right time.
Regularity first
A few minutes every day beat a long session now and then: that is the whole point of a daily grid. Your streak of days played helps you keep the pace.
What these games promise, and what they do not
These games work attention and memory while making the exercise enjoyable. They are no substitute for medical advice: if you have memory concerns, talk to a health professional.