Sudoku, Tic Tac Toe and Chess were games we played at 80s - that's an entire decade of my childhood
I have some nostalgia for these classics so here is one more remake.
Play link: https://minimindgames.com/en/boardgameproblems/
The really interesting stuff (this being game dev forum) is that I tried this HTML5 game on Android WebView and it worked with almost no effort at all, see https://play.google.com/store/apps/details?id=com.minimindgames.boardgameproblems. Not bad, huh? I'd say HTML5 things are changing for the better on mobile.