Closed beta participants can still play for free, but newcomers will have to pay $30 to try it out next week.
The Large-Scale Tech Test for the game starts today. Anyone can sign up and play the game before its release.
The launch of the test will also include a new game mode that features two requires two teams with four players on each side.
Looking for some old school 3D Realms action? Here are the specs to the Rise of the Triad reboot, and a link to a free copy of Shadow Warrior Classic.