my fave grandma phone games: sudoku, crosswords, solitaire, jigsaw puzzles, seeker's notes, merge mansion, murder in the alps & murder by choice (the dev that makes these is awesome and makes absolutely amazing games but sadly i had to stop playing them bc you kinda have to pay to play and it got so expensive lol), 8 ball pool, candy crush, any kind of escape game but my fave on the play store are the ones by the nakayubi corporation, hitman sniper, love nikki dress up queen, medieval idle prayer, miracle merchant, sporcle, tomb of the mask, underhand, wordscapes, and tetris. miracle merchant and underhand in particular are little known games that are really fun, super creative, and have great art. i don't play about my mobile games!!! but sadly i can only have one or 2 downloaded at a time bc i never have enough storage on my phone
