Walkthrough/FAQ - IGN

PlayStation Plus PS1 Classic 'Syphon Filter' Adds Trophy Support, What About The Rest?

Syphon Filter - The Cutting Room Floor

Syphon Filter -- Gameplay (PS1)

Syphon Filter - PS1 Gameplay Full HD

Syphon Filter 2 - Sony PlayStation 1 PSX PS1 - Empty Custom Case

Syphon Filter 3 – Sony PlayStation 1 PSX – Retro Games Reproduction

Syphon Filter (1999) PS1 / PS5 Gameplay - The First Mission

Syphon Filter (Europe) PSX ISO - CDRomance

Syphon Filter 2 (USA) ISO < PSX2PSP ISOs

I dug into the OG Syphon Filter PS1 ROM and tried upgrading the cinematics to higher res and 30FPS (from 160P 15FPS originally) : r/SyphonFilter