I like tetris. I found these two to be the most fun for me:

- https://www.goodoldtetris.com/ - http://farter.cn/tetr.js/

First one is "NES-style" with fast lock in, no ghost and so forth. Second one is for fast play, with ghost and no fast lock-in. I have no clue about current tetris, but i think that's the modern style, no???

Edit: I believe tetris friends was the website where i started playing more tetris some years ago and the version from farter came closest to it, after it got shut down