What engine powered the original releases of Tetris Effect?

The original releases of Tetris Effect were powered by Unreal Engine 4. The engine supported the game’s combination of classic block-stacking, responsive visual effects, music-driven environments, and its optional virtual-reality presentation.

Tetris Effect was developed by Monstars and Resonair and first released for PlayStation 4 in 2018. Its visual identity is much more elaborate than that of traditional Tetris: stages react to the player’s actions, while lighting, particles, backgrounds, and sound are designed to work as one audiovisual experience.

The answer refers to the original versions, not every later edition. The PlayStation 5 release of Tetris Effect: Connected was upgraded to Unreal Engine 5, partly to support the newer PlayStation VR2 hardware. That later engine change is the main reason a quiz answer can become confusing if the release period is left unstated.