Jstris is a browser game created by jezevec10 and released on December 6, 2014. It is one of the unofficial online Tetris games to be playable on a browser.
The game uses modern guideline rules, such as holding pieces, SRS rotation system, etc.. Players are able to create their own rooms and change gameplay rules for that room such as changing previews, modifying the attack table, making it a team room, and more.