What year did the game "Overwatch" enter closed beta?

The game Overwatch entered closed beta in 2015. This was the year that Blizzard Entertainment, the game's developer, made the decision to allow a select group of players to test and provide feedback on the game before its official release. By conducting a closed beta, Blizzard aimed to gather valuable insights and make necessary improvements to ensure a polished and balanced gaming experience for players around the world.