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
Help us push aside the stigma and discrimination surrounding complex mental health and change the way people talk about, and care for, mental illness.
SANE acknowledges the Traditional Owners of Country throughout Australia and recognises the continuing connection to lands, waters and communities. We pay our respect to Aboriginal and Torres Strait Islander cultures; and to Elders past and present.
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Help us push aside the stigma and discrimination surrounding complex mental health and change the way people talk about, and care for, mental illness.
SANE acknowledges the Traditional Owners of Country throughout Australia and recognises the continuing connection to lands, waters and communities. We pay our respect to Aboriginal and Torres Strait Islander cultures; and to Elders past and present.
SANE values diversity. We are committed to providing a safe, culturally appropriate, and inclusive service for all people, regardless of their ethnicity, faith, disability, sexuality, or gender identity.