Really Bad Chess was a daily driver for me. I loved the chaos, which strangely collapsed to recognizable patterns and strategies based on difficulty and board layout.
Oh, you said phone browser. Are you against native apps?
2048 is fun - you can probably find a browser version of that.
Chess gives me anxiety - like I’m supposed to play to win and not just enjoy the game, unlike, say, Sudoku where getting stuck or filling the grid wrongly doesn’t seem as life or death.
You may find the same anxiety as in real Chess but for me RBC is just a fun, soft brained exercise.