Policenauts is an adventure game in a similar style to Kojima's Snatcher, consisting of mostly still images with fully-voiced dialogue and a text-based menu interface. The game follows Jonathan Ingram, a one-time policeman on an extraterrestrial Earth colony, who drifted into space and returned to Earth 25 years later, having been saved by a "cold sleep" system in his suit. Following his return, he works as a private investigator and attempts to solve a murder and a mysterious disappearance.
The patch requires a copy of the Japanese PlayStation version of the game and a PlayStation that can play CD-R discs -- that's because you have to rip the game files, apply the patch, and then burn it to another disc. Finally, a reason to dust off that PlayStation you modded to play Beatmania ten years ago!