According to the broadcaster, this has been done through a transaction carried out through THR Media, which is in the process of joining the Prima Group.
THR Media now owns 50% of Playzone and financial details of the deal have not been released.
Playzone, which has been merged with the Prima thematic channel Prima Cool, has been running www.Playzone.cz, the leading gaming portal in the Czech Republic and Slovakia, for more than a decade.
The portal has more than a million unique users each year.
Playzone has also been responsible for organising gaming events and live broadcasts of such events.
Up until now it has been solely owned by Lukas Pleskot, its executive director.