'Half Life 3' release date is waiting on improvements in the game's source engine Improvements.

Valve said that they are not producing Half Life 3 soon, but fans have come up with several theories as to why the game is not yet in development.

Valve teased about "Half-Life 3" earlier this month in the update files for the Massive Online Battle Arena (MOBA) game "Dota 2."

There was a mysterious file included in the "DOTA 2" downloadable content pack update called "hl3.txt." The document is said to contain codes unrelated to DOTA but Valve didn't make any announcement on whether Half Life 3 is in accessible.

Gamer Rant reported that the file contains various references to features like zipline, procedural spawning, NPC speech and VR movement. MasterHerald reported that the text files could be referencing the Half Life series such as VY movement, Chaperone, Squads and, apparently, Combine pulse ceiling turrets.

Valve head Gabe Newell said the Half Life 3 release date depends on the developers.

"The only reason we'd go back and do like a super classic kind of product is if a whole bunch of people just internally at Valve said they wanted to do it and had a reasonable explanation for why [they did]," Newell told IGN.

For fans who can't wait, a new game was released online called the Gabe Newell Simulator, which allows gamers to take on the role of Gabe Newell and maybe release "Half Life 3."

"'Gabe Newell Simulator' is a game for those who have always dreamed of being the glorious PC Master Race Gabe Newell! You can impersonate Gabe and help him in his fight against other companies and make the decision to release 'Half Life 3' or not, and this will have consequences in the whole world!" wrote the Steam Community page.

The third installment of the role-playing game is available for Steam subscribers for early access for $6.78.