Zynga will no longer be tied so closely to Facebook as a new deal between the two will level the playing field between the FarmVille firm and its competitors.
The giant of social games was once the single biggest earner for the world's largest social network, responsible for as much as 12 percent of Facebook's revenue.
The benefits were most likely a better revenue share, but an SEC filing released today says Zynga's Facebook games will now "be governed solely by Facebook's standard terms and conditions for game developers."
Investors have taken the news as a serious blow, and share prices have fallen 12 percent in after-hours trading.
A clause was also renegotiated that formerly prevented Facebook from launching its own games, but the company tells Reuters it has no plans to enter game development.
The move has merit for both companies, as Zynga is now able to devote more resources to Zynga.com and its mobile initiatives, and Facebook can devote more attention to its new top-earners.