Valve has announced Steam support for free-to-play titles with immediate effect.
Five launch titles are available now: Spiral Knights, Forsaken Worlds, Champions Online: Free for All, Global Agenda: Free Agent, and Alliance of Valliant Arms (AVA).
Starting tomorrow with Spiral Knights and ending on Sunday with AVA, each one will get a 'F2P Game of the Day' slot which will see exclusive in-game extras up for grabs.
"The introduction of Free to Play games is another example of the constant evolution of Steam," commented Valve exec Jason Holtman.
"Free to Play games offer new game genres and game experiences for customers, while offering developers and publishers new revenue opportunities and the ability to reach customers in areas of the world where the traditional packaged goods model is less popular than F2P."