SCPM: Thanks to WinterSnowfall, and all new know-how, GOG API entries have been discovered for the following games:
Azur Lane: Crosswave
BasketBelle
Battle Shapers
Bus Simulator 18
Cassette Beasts
Clair Obscur: Expedition 33
Crusader Kings III
Deathloop
Detroit: Become Human
Empire of Sin
Escape From Norwood
Final Fantasy I
Final Fantasy II
Final Fantasy III
Final Fantasy IV
Final Fantasy V
Final Fantasy VI
Frog Detective 1 + 2 + 3
Heretic's Fork
Horizon Forbidden West
Iron Lung
Marvel's Spider-Man: Miles Morales
Panzer Dragoon II Zwei: Remake
RAGE
Ratchet & Clank: Rift Apart
Realms of Magic
Resident Evil 4
Sifu
Smile For Me
Somerville
Soulstice
Tarnished Blood
Teenage Mutant Ninja Turtles: Shredder’s Revenge
The Last of Us Part I
The Procession to Calvary
Toribash Next
Unknown 9: Awakening
Unreal Tournament 3
Vampire: The Masquerade - Swansong
Viewfinder
Wanted: Dead
Zipp's Café DISCLAIMER 1: The identify of these games were merely deduced based on circumstantial API data. So, I'm basically just a $#!t-posting GOG user providing no evidence whatsoever to back up these claims, take anything you see with a grain of salt.
DISCLAIMER 2: A member of the GOG staff already teased that they would try to fool me with misleading red herrings.
DISCLAIMER 3: A number of these entries, including some of the biggest names here, have been inactive for years. Bus Simulator 18 by all accounts appears to have been otherwise wiped from GOG's API, and Unreal Tournament 3 has been inactive since the re-release cancellation announcement. So don't expect any one of these games to come anytime soon just because I'm posting this now.
This is such an incredibly good list that I'm really trying not to believe it too much.
So many things I'd want.
Unreal Tournament 3 is an interesting one, given that Epic pulled the other Unreal games, and UTIII largely disappeared off the face of the earth at some point. Great game, though. Different from 2k4, but still very compelling
The introduction of Square-Enix (y'know, the actual Japanese games they've published) would be amazing. They're one of the last big Japanese publisher holdouts. The Pixel Remasters weren't so good due to the stuttering issues that were never fixed (barring some sort of GOG Preservation Program sprucing), but there are an absolute ton of games I'd gladly buy or rebuy here.