Previously released on PlayStation 4, Tetris Effect looks great in VR. However, PC headset owners looking to try out the puzzle in VR might be surprised that the game uses Valve's SteamVR API. Yes, Tetris Effect on PC is an Epic Games Store exclusive, but Epic hasn't been shy about adding a game that uses SteamVR to its library.
Tetris Efffect supports the HTC Vive and Oculus Rift headsets, with the game's Store FAQ confirming that SteamVR is only required for the first headset. The page notes that users with an Oculus Rift headset can use Oculus VR instead. However, an Epic Games representative, at the request of DSOGaming journalists, confirmed that both helmets require SteamVR to run in the background.
Although many players were surprised by the use of the API from Valve, it is still not required to log into Steam. Perhaps the use of Steam VR was simply inevitable if the developers of Tetris Effect wanted to provide support for the HTC Vive. It is also worth adding that if you run the game in normal mode, without any virtual reality, no additional libraries are required.
Source: 3dnews.ru