Not much of a gamer… I play Free Cell and the like.
Recently, I downloaded Diced from Agile Tortoise, a quick paced game. A doctor’s office waiting room game… Phone or iPad…
Any favorites of your own? A particularly refined version of Sudoku? Or?
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Not a big gamer myself, but love these to kill the time
Metro
Prune
Alto’s Odissey
Monument Valley
Another non-gamer, but my indulgence is Threes
Since you’re not much of a gamer– try Shades. I enjoy it!
Oh I have a folder of these! And yet I usually find myself automating something instead 
Mini Metro can be more complex, but it’s also fun to dip in and out of. Dots is one of my favourites for some reason - with Strata coming a close second!