That could theoretically be a lot more games than the four first-party Sony titles we already know about:

Horizon Forbidden West (2021) Ratchet and Clank: Rift Apart (June 2021) God of War: Ragnarok (2021) Gran Turismo 7 (2022)

Even, as The Verge points out, Sony may not “well on the hook to make any of the unlisted games.” The logo of the PlayStation Studios “is a bit murky,” and when it went to the first release, Eric Lempel, the Sony Interactive Entertainment head of global marketing, said to GamesIndustry.biz, “the name does not imply that the developer is wholly owned, but it just means that we first picked it up. We don’t have the developer in certain ways.” Wired listed the studio indie games with Sony including Kena: Spirit Bridge and a Haven Studios title. It is not, however, clear if these and other such titles are part of Sony’s 25 plus games. There is still enough evidence that it would take a while for any of these games to become accessible. Hulst said some of the games would be small and require less time to produce and develop, but it doesn’t seem like it will happen in the near future. Besides, a lot of the games would not form an integral part of current franchises, which is really interesting for non-AAA players. In addition, these games would not exclusively be PS5 and Sony said that they would like to get more of their games onto the PC Platform. Any of the titles will also be available for PS4 and PS5. Although it is exciting to hear that Sony works on a range of PS5 titles, perhaps many more than we’ve ever heard about. The most recent income estimate by Sony shows that 7.8 million PS5s have been sold; many customers are looking for experiences to support the costs of the PS5, and Sony appears to be seeking to secure that it is on the ground.