As spotted by Gematsu, they are Syphon Filter, Syphon Filter 2, Syphon Filter: Dark Mirror and Syphon Filter: Logan’s Shadow.
Developed by Sony’s Bend Studio (formerly Eidetic), the first entry in the third-person shooter stealth series was released for PSOne in 1999. Its sequel arrived the following year for the same console.
PlayStation Plus Monthly Games - PS5 & PS4 - April 2022
There were two other entries in the series, 2001’s Syphon Filter 3 for PSOne and 2004’s Syphon Filter: The Omega Strain for PS2.
It’s expected that the games rated in Korea will be made available as part of Sony’s expanded PlayStation Plus service, which was announced in March for PS4 and PS5.
Launching in June and structured across three payment tiers, it will combine existing subscription offerings PS Plus and PS Now, phasing out the branding of the latter.
PS Plus Essentials offers the same benefits as the current PS Plus service, with monthly free games, discounts and online multiplayer. It will also cost the same: $9.99/€8.99/£6.99 a month, $24.99/€24.99/£19.99 for three months, or $59.99/€59.99/£49.99 a year.
PS Plus Extra will include the same benefits but with access to a library of 400 downloadable PS4 and PS5 games. It will cost $14.99/€13.99/£10.99 a month, $39.99/€39.99/£31.99 for three months, or $99.99/€99.99/£83.99 a year.
PS Plus Premium will include the above benefits but adds up to 340 additional games including PS3 titles available via cloud streaming, and a catalogue of classic games available in both streaming and download options from the PSOne, PS2 and PSP generations.
Priced at $17.99/€16.99/£13.49 a month, $49.99/€49.99/£39.99 for three months, or $119.99/€119.99/£99.99 a year, Premium will also include time-limited game trials.