Are we finally going to be able to play Half-Life 3? While Valve isn't exactly holding press conferences or sending marching bands through the streets yet, a recent slip in its system supposedly exposed the details of every project it's ever worked on—including the long-fabled conclusion to one of gaming's best series, as well as Left 4 Dead 3 and Source Engine 2.

The tip-off comes to PC Gamer via ValveTime , who recently received alleged screenshots of Valve's internal project-tracking software (Jira) during a momentary lapse in which is the system was made public (it has, of course, since been locked up tight again). The images show a 42-employee mailing group for a project entitled "Half-Life 3," as well as a mailing group for "Left 4 Dead 3" with 68 recipients.

Meanwhile, the development of Source 2 appears to be plugging along nicely, with the numerous groups devoted to the project hinting it's in full swing. Other project listings include familiar names such as "Return to Ravenholm," "Steam Box," and "Episode 3," as well as the more mysterious "F-Stop" and "SteamMMO."

One of the screenshots sent to ValveTime.

Before we start waving about banners emblazoned with Gordon Freeman's handsome face, we have to keep in mind that this info dump is in no way an official confirmation of anything. Firstly, these screenshots come from an anonymous source and cannot be verified. Secondly, Jira catalogs everything that has ever been worked on within Valve's walls, regardless of development stage, and some of the listed titles may very well have been canceled years ago.

ValveTime hypothesizes that games further in their development cycle have multiple mailing lists, as Left 4 Dead 3 does—suggesting that it is in active development. This is in contrast to Half-Life 3's single group, which suggests that its development is either inactive or in the very beginning stages.

We'll be keeping our ears perked for further details. In the meantime, let's pray that a tiny Half-Life 3 embryo is kicking about somewhere in the Valve HQ, preparing to grow into something grand.