TETR.IO is pretty much the Tetris-like experience for me. It offers loads of customization for matches, from arena size to the type of block spins to give a bonus. I'm not nearly as technical or hell, good as a lot of other people playing this but I can say that even as a casual experience Tetr.io is an absolute huge recommend. Especially since it allows for unlimited size lobbies that anyone can join in a click with or without an account - it massively streamlines the process, making it perfect for both competitive challenges and duels against friends. This is all topped off with well-refined presentation - the visuals and sound are on point. There's nothing quite as satisfying as pulling off a T-Spin double and seeing your board flick to the side as you do, followed by the sound when you land the piece.