Nexon Korea and IMCGames will be hosting an Open Closed Beta for Tree of Savior Online. What does the term Open Closed Beta mean? It means anyone with a Nexon Korea via MapleStory2 or Closers Online account will be able to participate in the upcoming test thus the "Open" part. However, I use the term "Closed Beta" because the game will have a data wipe before the official real Open Beta. More details about the testing date and schedule below.