Zyngas deal with Zenimas media division, Zyngia, was officially announced on Thursday.
The deal was expected to be completed in the coming weeks.
Zenimax said that it will buy 50% of the company for $5.7 billion, with Zynges share price rising to $1.5 billion, from $1 billion.
Zynga is an online video game platform that allows players to make video game videos.
The deal is expected to close by the end of the year.