Tetris Effect: Connected is a paid, premium title available on major platforms, though you can find limited free content related to the game, such as its soundtrack or various fan-made assets. Official Free Content
If you are looking for "Tetris Effect" style assets for your own projects: tetris-effect-free-download
: LottieFiles provides free Tetris-themed animation packs for UI/UX designers. Where to Buy Tetris Effect: Connected is a paid, premium title
: While not the "Effect" version, you can play the official Tetris game for free in your browser. Creative Assets & Templates Tetris Effect: Connected is a paid
To get the full game safely and legally, it is available on: Tetris® Effect: Connected on Steam