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Doing jigsaws is actually good for your health and is shown to have a number of benefits. I find them to be a good form of relaxation. I have never been one for yoga and other traditonal forms of mindfulness. An article I read puts it like this: "Talk about being fully in the moment. When working on a jigsaw puzzle, my worries melt away as my attention remains laser-focused on one thing: where does this puzzle piece fit? It is similar to gazing at a painting in a museum. Looking intently at the beautiful image in front of me is relaxing, and according to some studies, can translate to physical benefits, including lowered blood pressure."
When I do a jigsaw I usually focus on it and as another article I read, enjoy a break from technology and improve my memory at the same time.
To keep cost down, I usually buy jigsaws at 2nd hand shops and donate them back when I am done.
References:
https://www.guideposts.org/better-living/health-and-wellness/living-longer-living-better/6-surprisin...igsaw-puzzles
ahhhhh that is nice @Adge 
50 to 100 piece ones are good
i have done big ones like 1500 pieces but i am finding hard to find time to continue
I might do some 5oo piece ones might be good to do