I've been browsing though the mass of games I have, and I've noticed two standouts:

One of the Carmegeddon games offers a photo of the devteam, and System Shock Enhanced offers up a TV commercial, The Real Texas offers papercraft figurines, and Twinsen also offers the dev photo.


Least uniquely: "Bugger off, we owe you nothing" (No extra), and just the manual; which can hardly be considered an extra.

- Ben There Dan That & Time Gentlemen Please : Funky Ringtones.

- I Have No Mouth And I Must Scream : Includes Harlan Ellison's novel that the game is based on.

- Indiana Jones and the Last Crusade : A Holy Grail diary.

- The Inner World : How to crochet Peck the Pigeon guide.pdf

- Pinstripe : Mobile phone wallpapers. A bit low-res by today's standards though.

- The Longest Journey : I wouldn't say walkthroughs / guides are 'unique' but TLJ still includes one of the few GOG-branded walkthroughs they wrote back in 2009. Haven't seen any more of those in a long while.

- The Secret of Monkey Island : Still comes with "Dial A Pirate" code-wheel you can print out, cut the holes in the right places then stick one of those 'split pins' in the middle.

- Wallace & Gromit's Grand Adventures. Includes the TV mini-series "Cracking Contraptions" (10x short 1-3 m long episodes).

I have yet to see anything coming close to Witcher 3 (see attached screenshot.)

Dishonorable mention: Tyranny. 3 ringtones. All of which suck.

Yeeeah, but I felt mentioning games like Zork or the Witcher would be rather cheating the game; seeing as one is multiple goodies across an entire series and the other was meant to entice people to go buy the game digitally or otherwise.

Divine Divinity: Contains a tech demo of "The Lady, The Mage, And the Knight" (working title), the game that Larian tried to make before DD, with the involvement of Attic Entertainment, the developers of Realms of Arkania, who wanted to turn it into a Dark Eye RPG. Apparently Attic had too high demands and overblown ambitions for the game and miscalculated the budget, so the project failed and Larian made Divine Divinity instead. Tbh, I've never played the tech demo, but I'm kind of curious about it now, after learning of the story behind it.

Some games come with themselves as the extra (a 32-bit binary only), i.e. Icewind Dale comes with the game extra Icewind Dale. Most other distribution platforms would probably elect to call this an alternate version of the game being sold rather than classifying it as an "extra" alongside wallpapers, ringtones, and the like - so it might in that way be considered unique to GOG.

I might go with Retro City Rampage -- including DOS & NES ported/tech-demo versions of the game.

F.E.A.R. comes with the very first part of this machina they collaborated with Rooster Teeth... eons ago.

Blood comes with this music video by Type O Negative.

Probably not the most unique, but Warhammer: Mark of Chaos has some very rich extras, including:

- 400 pages novelization of the game (didn't read but allegedly it's not half bad)
- postcards (really just promo screenshots in a postcard format I guess)
- physical boxes covers
- promo article from White Dwarf magazine - but here is really unusual thing: for some reason that PDF consisting of whole 2 pages takes whopping 125 MB

Oh, the Sim Earth Manual was basically an introduction to earth sciences + a course in the Gaia theroy of planetary regulation. I had a copy of it, the SNES manual simply doesn't compare, and the other versions are so obscure, I'd have no idea if their manuals have ever surfaced.


Addendum: Treasure Adventure Game was a playable prototype, and some might argue was even the better version.

Ultima 4 has an interview with Richard Garriott.

Ultima™ Worlds of Adventure 2: Martian Dreams has some design documents, which I believe cover Ultima 6 and Savage Empire (though I believe they date from before Ultima 6 was released, and some of the details did change before the final release).

(Even better: All the games I mentioned here are available (legally) for free on this very website.)

Depends on age and how far back you go. I am old enough to know the excitement of big box games, including full size cloth maps, jewelery and other free pack in items.

Papers, please ?

VVVVVV has one, as does one of the earlier Divinity games.