Unturned is a free-to-play post-apocalyptic zombie survival game developed by Smartly Dressed Games, and originally started as a browser game before moving to Steam.
The game has gone through three distinct iterations: "antique," "classic," and "version 3." A "preview" branch can be opted into that allows for public testing before an update goes live. The game is available from its store page, and community features can be easily found through its community hub.
The antique iteration predates Unturned's availability on Steam. First publicly accessible in 2013, antique was the first iteration of Unturned and was created as the spiritual successor to Deadzone. The game continued to see development until 2014.
Unturned was first available on the Steam platform in 2014, during its classic iteration. With the release of classic, antique was no longer accessible.
Version 3 is the latest and final iteration of Unturned, and is the iteration downloaded when first installing the game. The game left early access while in this iteration, on July 7, 2017.