This is an impressive free browser-based Tetris fan game, with a respectable suite of modes including ranked online play, extremely detailed gameplay customization, controller support, and very useful convenience features designed around heavy practice sessions. All made by a solo developer but has a sizable player base -- nice job.

I will be using this for practice almost exclusively now over the officially licensed modern Tetris games, which have slow menus and animations or other distractions and limitations that get in the way. Or in the case of Puyo Puyo Tetris, you have to hear an anime fish yell "Oh yeah baby!" or something every time you clear a line -- nice to get a break from that.