As above:
https://www.gog.com/redeem/VVYA9NRLCK4CE7HPYL

All-time high discount on 2D pixel artwork (Symphony of War: The Nephilim Saga, 9 Years of Shadows, Coromon and One Lonely Outpost):

VVYA4A9M7MT7R4TRXRGOG

remove GOG at the end of the code to use it

I missed sharing a few codes I didn't use... These games do look cool to me, but I guess I am going to save money for now.
I hope someone else is more interested:
VVYA<four>NU<seven>TRFVCJMPYE

Symphony of War: The Nephilim Saga (-40%)
One Lonely Outpost (-25%)
9 Years of Shadows (-35%)
Coromon (-60%)

Redeem until November 30th, 2023, 2 PM UTC.

YAP6A3NW7UPKXR4RT7

(Classic Quake games)

Exclusive discount on classic Quake games (Quake, Quake 2, Quake Arena, Quake 4). The offer ends on December 3rd, 2023, at 2 PM UTC. Quake 4 and Quake III Arena are not available in Germany.

YAP649UM9WHCXVYRUXGOG

remove GOG at the end of the code to use it

Another Quake discount code:

YAP64UYYMRKHEN7VJT

YAP6VTWWPTKJWH9NYX: classic Quake games

Classic Quake games
YAP64TFYV39L4UJ9N3

YAP6FP94YTCRKWKANE
quake

Classic Quake games

Discount code: YAP69A
TANWRFW3CMNN

Quake Classics discount code

YAP6ESHOOTER4URXL

SHOOTER = VLFVKKVK

Another code for Quake classics. Already have them all but my Q4 comes from Prime and GOG refuses to mark it as owned.
https://www.gog.com/redeem/YAP6E3HR7MEUJVFFEE

Games: Classic Quake games

Discount code: YAP6WTL79PRPVYKKYT

The Wreck
Shotgun King: The Final Checkmate
Spellcaster Univer-sity (I don't know why, but GOG blocks me posts containing that name!)

https://www.gog.com/redeem/9CXG9UVRAVHRMCXKXE