And the key was present way before the pinatas:
https://www.gog.com/forum/general/gog_games_with_serial_numbers/post207

Many people feed random keys to GOG's redeem system, and did get random games sometimes.
It is a bug, not a feature.

With the new website changes, GOGmixes are no longer visible on a game's storepage. Add to that the brokeness of the GOGmixes themselves (inability to create new ones or modify existing ones) for well over a month and the bell has tolled for them. As such, the GOGmix link will eventually become outdated and will be available only for posterity, till GOG eventually unplugs the life support unit from it.

The forum thread will require a bit of modification, along with potential linking to an external source, to explain what is the use for each serial.

The GOGmix is no longer accessible. I have replaced the opening link with an archived one that should be as up-to-date as possible before the Great GOGmix Purge commenced.

Hamachi stopped being good after this one specific version, which you'd always have to reinstall due to auto-updates. Do people still use it?

You replied to a four-year-old post from a user who hasn't been active here for a couple years. ; ]

I did, but since the thread remained active I figured someone would respond. :)

Neverwinter Nights: Enhanced Edition
have auto-gen serial key in GOG Library.
(You WILL NOT get another copy of Neverwinter Nights Diamond if you have owned the game, it only automatically added to your account if you did not have it.)

Warcraft II has a serial key included. Shame this thread seems to have been dead for ages.

Thanks for that info. The thread was meant to complement the GOGmix, but since GOGmixes are now dead, it would need some rework before it was made as a standalone.

Aye. A GOG Mix would have been perfect for something like this. I was making a small list at https://www.gog.com/forum/general/games_with_serial_keys until I was pointed to this thread. Who knows? Maybe something worth mentioning there.

Bump. Is it still relevant?

Anyway, + DEFCON and Multiwinia

www.gog.com/forum/general/defcons_drm_is_still_active_support_doesnt_give_a_crap

Multiwinia just didn't have its key revoked, I guess

It's good to know that you are working about it.
But from your past record I won't expect much.

DOOM 3 Classic included in DOOM 3: BFG Edition requires owners to provide their serial key from both base game and Resurrection of Evil found under their game library on the website (for some reason it does not show on GOG Galaxy) to play these games.