A former Ensemble Studios developer says the long-rumored Halo MMO, code-named “Titan,” was scrapped to serve a short-term executive payout. In a series of posts on X, Carl Sanford Joslyn Petersen (better known as “Sandy”), who worked at Ensemble, alleged that then-Xbox leader Don Mattrick shut down both the project and the studio because the game wouldn’t ship within his three-year bonus window.
“In 2008, Ensemble Studios started planning a gigantic MMO set in the Halo universe. We code-named it Titan. It was to take place tens of thousands of years ago, before the Halos were set off & destroyed all sentient life in the Galaxy,” Petersen said.
“It was all brought to naught when Don Mattrick realized that his stock bonus was based on the income MS had from games in 3 years… So by firing ALL of Ensemble, he didn’t have to pay for our expensive studio for 3 years and he didn’t care about Titan,” he added.
Petersen added that Microsoft had internally modelled $1.1 billion in revenue for Titan and that the team had mapped out quest lines and home worlds, with players aligned to factions inspired by the Forerunners and Covenant (the Flood were planned but not playable).
Ensemble was shuttered in January 2009, with work on Titan believed to have taken place between 2004–2007 before the team pivoted to Halo Wars.
Petersen’s posts also included a blunt assessment of Mattrick’s tenure: “All he lost was a game studio who never sold less than 3 million copies of everything we made. I don’t believe he did justice to Microsoft stockholders, but hey, Don started as an EA hatchet man, so what would you expect?”
Microsoft has not commented on Petersen’s latest claims. During and after the studio’s closure, other Ensemble veterans previously attributed Titan’s cancellation to internal reorganization and cost/risk concerns around building an MMO.
