There's an older list on this forum, but it was getting quite out of date, so I made an updated one. This is focused on older games, feel free to make your own if you want to include all the recent stuff also.

0-9
1nsane

A
A.D. 2044
Adventures of Willy Beamish, The
A.I.M.: Artificial Intelligence Machine
Akalabeth: World of Doom (free)
Albion
Alien Breed + Tower Assault
Alien Nations
Alpha Protocol (updated version)
Amazon: Guardians of Eden
American Hero
American Hero Unrated
Amerzone: The Explorer's Legacy (1999)
Anno 1404: Gold Edition (original version)
Anno 1503 A.D. (original version)
Anno 1602 A.D. (original version)
Anno 1701 A.D. (original version)
Anstoss
Anstoss 2 Gold Edition
ANSTOSS 3: Der Fußballmanager
Anvil of Dawn
Apache Longbow
Arabian Nights
Archimedean Dynasty
Army Men: World War
Atlantis Evolution
Atlantis: The Lost Tales
Atlantis 3: The New World
Avernum: The Complete Saga

B
Battle Isle Platinum (includes Incubation)
Battle Isle: The Andosia War
Battle Realms + Winter of the Wolf
Battles of Destiny
Betrayer (free)
Beyond Good & Evil™ (original version)
Biing!: Sex, Intrigue and Scalpels
Bio Menace (free)
Bioforge
Blade Runner (original version)
Blood Omen: Legacy of Kain
Braid (original version)
Breach
Breach 2
Breath of Fire IV

C
Caesar
Caesar II
Call of Cthulhu: Dark Corners of the Earth (patched version)
Cannon Fodder
Cannon Fodder 2
Catacombs Pack
Chaos Overlords
CLARC
Clash
Clive Barker's Undying
Codename: ICEMAN
Colonel's Bequest, The
Combat Mission: Afrika Korps
Combat Mission: Barbarossa to Berlin
Combat Mission: Beyond Overlord
Conqueror A.D. 1086
Conquests of Camelot: The Search for the Grail
Conquests of the Longbow: The Legend of Robin Hood
Corsairs Gold
Countdown
Croc Legend of the Gobbos
Crusader: No Regret™
Crusader: No Remorse™
Crusaders of Might and Magic
Cultures 1+2

D
Dagger of Amon Ra, The
Dangerous Dave Pack
Dark Heart of Uukrul, The
Dark Reign + Expansion
Dark Reign 2
Demon's Winter
Diablo + Hellfire
Die By The Sword + Limb From Limb
Dino Crisis
Dino Crisis 2
Doomdark's Revenge
Dragon Lore: The Legend Begins
Dungeons & Dragons: Dragonshard

E
ECHELON
Elvira: Mistress of the Dark
Elvira II: The Jaws of Cerberus
Emperor: Rise of the Middle Kingdom
Empire Earth 2 Gold Edition
Empire Earth 3
Empire Earth Gold Edition
Empire of the Ants (2000)
Empires: Dawn of the Modern World
Enemy Engaged: Apache vs Havoc
Enemy Engaged: Comanche vs Hokum
Entomorph: Plague of the Darkfall
EPIC + Inferno Bundle
Epic Pinball: The Complete Collection
Europa Universalis
Europa Universalis II
Evil Islands

F
Fallen Haven
Fallen Haven: Liberation Day
Final Liberation: Warhammer Epic 40,000
FireStarter
Flight of the Intruder
Forgotten Realms: Demon Stone
Freddy Pharkas: Frontier Pharmacist

G
Galactic Assault: Prisoner of Power
Galador - The Prince and the Coward
Gangsters: Organized Crime
Gary Grigsby's World at War: A World Divided
Gex
Gobliiins pack
Great Battles Collector's Edition

H
Hammer of the Gods
Hard Truck 2: King of the Road
Heart of China
Hearts of Iron
Heroes Chronicles: All chapters
Heroes of Might and Magic®
Heroes of Might and Magic® 2: Gold
Heroes of Might and Magic® 3: Complete (original version)
Heroes of Might And Magic® 4: Complete
Hind
Homeworld: Emergence
Hover Ace
Hugo Trilogy, The

I
I.G.I. 2: Covert Strike
Icewind Dale: Enhanced Edition (with original version)
Icewind Dale 2 Complete
Imperialism
Imperialism 2: The Age of Exploration
In Cold Blood (2000)
Incredible Machine Mega Pack, The
Interstate ’76® The Arsenal
Interstate '82
Ishar Compilation

J
Jazz Jackrabbit Collection
Jazz Jackrabbit 2 Collection
Jill of the Jungle: The Complete Trilogy (free)
Journeyman Project 2, The: Buried in Time
Journeyman Project 3, The: Legacy of Time

K
King's Quest 7+8 (for King’s Quest 8: Mask of Eternity)
Konami Collector's Series: Castlevania & Contra (this compilation; the games are on Steam, too)
Konung 1+2 (for Konung: Legend of the North)

L
Lands of Lore™ 1+2
Lands of Lore 3
Last Express, The (original version)
Legend of Kyrandia, The (Book One)
Legend of Kyrandia: Hand Of Fate, The (Book Two)
Legend of Kyrandia: Malcolm's Revenge, The (Book Three)
Leo the Lion
Leo the Lion's Puzzles
Lighthouse: The Dark Being
Links 386 Pro
Links: The Challenge of Golf
Links LS: 1998 Edition
Lords of Midnight, The
Lula: The Sexy Empire
Lure of the Temptress (free)

M
Magic Carpet™ 2: The Netherworlds
Magic Carpet Plus™
Medal of Honor: Allied Assault War Chest
Medal of Honor Pacific Assault
METAL GEAR (MSX version)
METAL GEAR SOLID (original Windows version)
Might and Magic® 6-Pack Limited Edition
Might and Magic® 7: For Blood And Honor®
Might and Magic® 8: Day Of The Destroyer™
Might and Magic® 9
MissionForce: CyberStorm
Moonstone: A Hard Days Knight
Mortal Kombat 1+2+3
Mortal Kombat 4
Mortal Kombat Trilogy
M.U.L.E.

N
Nations Gold Edition, The
Neverwinter Nights 2: Complete
Neverwinter Nights Diamond (included with Enhanced Edition)
North & South
Nox™

O
Outlaws + A Handful Of Missions
Outpost 2: Divided Destiny

P
Paladin
Paladin 2
Pandemonium 2
Panzer Elite Special Edition
Panzer General 2
Panzer General 3D Assault
Patrician 1+2
Pax Imperia - Eminent Domain
People's General
Perfect Weapon
Personal Nightmare
Pinball Gold Pack
Pinball World
Planescape: Torment (for the original version)
POD Gold
Port Royale
Privateer 2: The Darkening
Pro Pinball Big Race USA
Pro Pinball Fantastic Journey
Pro Pinball Timeshock
Project Eden
Pure Pinball 2 REDUX

Q
Questron II

R
Rage of Mages
Rage of Mages II: Necromancer
Rayman 2: The Great Escape
Rayman 3: Hoodlum Havoc
Rayman® Forever
Reah: Face the Unknown
Resident Evil (original version)
Resident Evil 2 (original version)
Resident Evil 3 (original version)
Restaurant Empire
Revenant
Rise of the Dragon
Robinson's Requiem Collection
Rules of Engagement
Rules of Engagement II

S
Screamer 4x4
Sensible Soccer 2006
Sensible World Of Soccer 96/97
Settlers 2: 10th Anniversary, The
Settlers 2: Gold Edition, The
Settlers® 3: Ultimate Collection
Settlers® 4: Gold Edition, The
Seven Cities of Gold: Commemorative Edition
Shadow Watch
Shard of Spring
Shivers
Shivers II: Harvest of Souls
Silent Hill 4: The Room
Silent Hunter® 2
SimCity™ 2000 Special Edition
Soldier of Fortune II: Double Helix - Gold Edition
Soldier of Fortune: Payback
Soldier of Fortune: Platinum Edition
Space Colony HD (original version)
Speed Busters: American Highways
Star Trek™: Armada
Star Trek™: Armada II
Star Trek™: Away Team
Star Trek™: Bridge Commander
Star Trek™: Elite Force II
Star Trek™: Hidden Evil
Star Trek™: Starfleet Command III
Star Trek™: Voyager - Elite Force
Starflight™ 1+2
S.T.O.R.M.
Stranglehold
Strategic Command: European Theater
Street Fighter Alpha 2
Strike Commander
Summer & Winter: Olympic Challenge
Supreme Ruler 2010
Swat 4: Gold Edition
Syndicate Plus™
Syndicate Wars™

T
Teenagent (free)
Temple of Elemental Evil, The
Theme Hospital
Theme Park
Throne of Darkness
Thunderscape
TigerShark
Tom Clancy's Rainbow Six®
Torin's Passage
Total Annihilation: Kingdoms + Iron Plague
Total Overdose: A Gunslinger's Tale In Mexico
Tyrian 2000 (free)

U
Ultima™ 1+2+3
Ultima™ 4: Quest of the Avatar (free)
Ultima™ 4+5+6
Ultima™ 7 The Complete Edition
Ultima™ 8 Gold Edition
Ultima™ 9: Ascension
Ultima™ Underworld 1+2
Ultima™ Worlds Of Adventure 2: Martian Dreams (free)
Ultimate Body Blows
Universe
Universe 2
Universe 3

V
Venom. Codename: Outbreak

W
War Chess
Warhammer 40,000: Chaos Gate
Warhammer 40,000: Fire Warrior
Warhammer 40,000: Rites Of War
Warhammer: Mark of Chaos - Gold Edition
Warhammer Quest Deluxe
Warhammer: Shadow of the Horned Rat
Warlords Battlecry
Warlords Battlecry 2
Waxworks
Wheel of Time, The
Wing Commander™ 1+2
Wing Commander™ 3 Heart Of The Tiger™
Wing Commander™ 4: The Price Of Freedom
Wing Commander™ 5: Prophecy Gold Edition
Wing Commander™: Academy
Wing Commander™: Armada
Wing Commander ®: Privateer ™
Wizard's Crown
Wizards & Warriors
World in Conflict: Complete Edition
World Rally Fever: Born on The Road
Worlds Of Ultima™ : The Savage Empire (free)
Worms 2
Worms Forts: Under Siege

X

Y

Z

Great job, very useful list.

I had no idea there was that many.

Someone(s) has gone to a lot of effort to determine all that.

Thanks for any effort of your own and for reviving this topic etc.

I'm still waiting on a true discount for a handful of those games. In fact I have been waiting so long I have basically given up on them.

If there is one thing I despise, it is fake rarity of a digital product, and a price to match.

I'm all for supporting GOG, and I have certainly done my share of that, no doubt above and beyond by now, but I draw the line at overpaying. I will buy more product, but I won't overpay ... I'd rather go without, just on principle.

Updated. Yes, there are quite a few of these and not all of them have the Only on GOG tag...

Also, I apparently can't post links (foo few posts maybe?) so I can't link to the original list.

Exactly, those tagged as Only On GOG may be part of your list

[url=https://www.gog.com/en/games?tags=only-on-gog&systems=windows&order=asc:title&hideDLCs=true]https://www.gog.com/en/games?tags=only-on-gog&systems=windows&order=asc:title&hideDLCs=true[/url]

The first 2,
A Kiss For The Petals - Maidens of Michael
Amazon: Guardians of Eden
Meet your criteria. You may want to review the list thoroughly. And thanks for the effort #tao-tao!

Updated. I think this covers most (but likely not all) of the exclusive Good Old Games now.

Thanks for the list. I really appreciate community efforts in putting resources like this together.

I seem to own Aliens versus Predator Classic 2000 on Steam actually. Is the GOG version different?

I looked for it on Steam but apparently missed it. Fixed, thanks for the correction.

Interesting list. Two more games:

Leo the Lion
Leo the Lion's Puzzles

Evenicle 2 is also missing from the list :)

I'm mainly interested in older games. If someone wants to make a list of the newer uncensored/NSFW games that are not on Steam, go ahead.

Then you should probably edit the thread title to reflect that. However, if you want your list to be as useful and complete as possible, it wouldn't be a bad idea to add it in.

Updated. It doesn't seem like I can edit the thread title, but I added a clarification.

Tokyo Clanpool

https://www.gematsu.com/2024/11/tokyo-clanpool-launches-for-switch-in-asia-pc-worldwide-on-december-19

Soon to be:
https://www.gog.com/en/game/croc_legend_of_the_gobbos

Announced as a GOG exclusive. Not sure whether the list includes only already released titles or if coming soon is enough.