85% off Darksiders Warmastered Edition
85% off Darksiders II: Deathinitive Edition
85% off Darksiders II Deathinitive Edition Soundtrack

https://www.gog.com/promo/20181123_special_promo_darksiders

Games silently added to BLACK FRIDAY MISCALLENOUS promo page:
https://www.gog.com/promo/20181121_black_friday_miscallenous

Shantae: Half-Genie Hero Ultimate Edition
We are the Dwarves

Thank you kbnrylaec, that’s useful information :) I wonder why gog decided to silently add new games to the sale, that’s frustrating and not a good strategy. I wanted to buy Avernum 3, which is on sale on Steam and Humble Bundle, but not here. I thought that gog wasn’t going to add new games to the sale, so I went ahead and bought the game. If suddently gog adds it today, it will be too late and that’s a loss for them, and also annoying for me because I prefer gog if possible (usually, I just wait, but not this time). At least, they should have announced at the beginning of the sale that new games would be added even if they did not tell which games, as several people have asked that question in the discussion thread for the sale news, without getting any answer from a gog employee

You mean it wasn't already discounted for the sale? That's a first.

Several users have noticed that, Edition variants of Tyranny were added to the Black Friday Sale:
https://www.gog.com/promo/20181121_black_friday_tyranny

NOTE
Tyranny - Bastard's Wound was and is listed in Paradox promo page, but not in the Tyranny promo page:
https://www.gog.com/promo/20181121_black_friday_paradox

Thank you!

Interestingly, the higher discount on Gold Edition makes it cheaper than Deluxe and barely more expensive than Standard. I'm just mentioning it in case it turns out to be an error and gets changed.

EVERSPACE and its DLCs silently added to the Weekly Sale:
https://www.gog.com/promo/20181126_weekly_sale

Do you guys know GOG's offering limited time discounts on selected games for new users? My alter ego on GOG got the email, but it expired before I managed to share with you. I haven't bought a thing from that alter ego.

Every newly registered user will get a time-limit promo.
About 2~3 days I think.

Well, I wanted to share, but didn't know do you know about it.

Those discounts are not shareable. Only new accounts can see those promo.
The newbie promo was mentioned several times on the forum, but I guess not many people knew it.

Unannounced x_promo up to 50% off:
https://www.gog.com/games?devpub=egosoft

If anyone know how to access its standalone promo page, please let me know.

Unannounced Weekend Sale:
https://www.gog.com/forum/general/list_of_gog_sales_that_have_a_standalone_promo_page

Unannounced Promo: The Bard's Tale IV
https://www.gog.com/promo/20181207_bt