The studio is valued at around 750 million euros, according to the offer.
Rovio said in a stock exchange release that it is not currently engaged in negotiations with Playtika. It said the board of directors is looking at the indicative offer to determine whether or not to proceed with it and how.
The release reminds that the indicative proposal is subject to a number of preconditions, including satisfactory completion of due diligence, final approval by the board of Playtika, a unanimous and unqualified recommendation from the board of Rovio, and entry into a combination agreement between Rovio and Playtika.
Shares in the studio went up by 38 per cent on Friday.
The non-binding offer marks the second attempt to acquire Rovio by Playtika. Helsingin Sanomat said Israel-based company made an unidentified offer of 8.50 euros per share for the entertainment studio in November 2022.
Playtika has made a number of acquisitions in the country in recent years, as it tried to expand its offering beyond casino games. Reworks, the studio behind Redecor, was acquired in 2019 for an unknown price and Reworks, the developer of Best Fiends, for around 340 million euros in 2021.
The studio, which was the fourth largest studio in Finland in 2020, was shut down less than three years after the acquisition, leading to the sacking of 124 employees in Helsinki in 2022.