Someone asked me if I have any puzzle books that can help his mother to overcome mild dementia.
I told him that another person bought the Logic9 book to encourage his father to practice the mind.
I do not know if it helps.
I gave him the link to buy the Logic9 books. There is also a video that explains how to use the book. Start with level 1, which is very easy and progress to the higher levels.
https://tankinlian.com/cart.aspx?ID=67
I also suggested that he can buy the tangram quiz and shape quiz books. They come with the plastic pieces. It is easy to form the shapes by looking at the solutions. After the subject has become familiar with the solutions, they can work on the actual puzzles.
https://tankinlian.com/cart.aspx?ID=62
The logic9, tangram quiz and shape quiz are also useful for kids to learn to develop their thinking and problem solving skills.
To encourage the kids to try these puzzles, parents and grand parents can give them a prize for doing ten puzzles. I tried this approach with my grand kids. It worked.