Total worldwide sales for Root Letter have topped 400,000 units, publisher Kadokawa Games announced.

The company noted that worldwide sales includes the total number of retail versions shipped for each region, as well as the total distribution amount of the download version.

Root Letter is a mystery visual novel. It is currently available for PlayStation 4, PS Vita, PC via Steam, DMM Game Player, and Yahoo! Game Plus, and iOS and Android.

Here is an overview of the game, via its Steam page: