If you could choose one type of puzzle for stimulating people with the start of dementia or Alzheimer’s what would it be?

I don’t think there is one. Unfortunately, people with Alzheimer’s have that condition in common, but they’re not all the same; therefore, one type of mental stimulation won’t be the best for all of them. It may be that a person who has been artistic during their life would keep finding exercising that passion helps offset the effects of Alzheimer’s in its early to mid stages.
Conversely, it could be something that uses other brain areas more helpful, like chess games. I personally don’t think it’s clear that puzzles either lower the risk of Alzheimer’s or slow its progression. However, it is clear that people with early Alzheimer’s may be aware of their memory lapses and feel angry and frustrated.
So I might recommend “location”-type puzzles such as “Where’s Waldo” or “Find the Differences” (in photos, for example) rather than memory puzzles—including word-type like crosswords.

You should choose the right one for your senior loved one based on their level of dementia. You don’t want to make the puzzle too challenging for them. Don’t choose one that is too complicated or challenging for the individual, as this can quickly frustrate them, which is the last thing you want.
The goal is to get something that’s not too easy for dementia patients early on because they may feel it’s too childish. Puzzles that bring back memories for seniors are the most enjoyable.
Custom photo puzzles with images of their loved ones or pets can enhance older people’s sense of belonging. The same applies to a mystery that features photos of a senior’s past or a picture of a picturesque place they have visited.

Exercising your brain can help keep your cognitive functions sharp. Professionals believe stimulating the brain can help prevent diseases like Alzheimer’s and other forms of dementia.
Doing crossword puzzles, playing chess, engaging in fun board games with your loved ones, and challenging cognitive games like sudoku can help stimulate your brain and produce lasting benefits.
Playing different board games like Monopoly can be one of the most entertaining ways to spend time with your loved ones while also helping you prevent isolation because you’re feeling companionship, which provides seniors with several protective health benefits.

Unfortunately, some seniors are diagnosed with dementia or Alzheimers, which threatens their brain health at certain ages. But the good news is that these diseases usually take so long to be developed, and some long-term treatments can postpone the process.
What is vital in the first steps of Alzheimer’s or dementia is to take action as immediately as they are diagnosed. Believe it or not, if you take practical activities and take the medicines just a couple of months earlier, you can postpone the development process for years!
Besides the medical part, brain training and routines are essential in this process. all the brain specialists tell their patients to make their brain maintain its activity by training it.
Playing games and doing activities can unbelievably improve brain performance. One of the best games for stimulating people with the start of dementia or Alzheimer’s is puzzles.
If I could only name one beneficial puzzle for people with dementia and Alzheimer’s, I would say jigsaw puzzles! Jigsaw puzzles are easy to find, cheap, and also amusing. It enhances short-term memory and also enhances the thinking process. Just play a jigsaw puzzle to boost the connection between the brain’s right and left sides. You can also play it with your beloved ones and friends and spend a couple of enjoyable hours.