And another one:
https://www.gog.com/redeem/J6ACCTXMFH4RMC4FHR

Hero's Hour -20% 11.99€

Redeem code

Offer ends March 4th, at 2 PM UTC.

Hero's Hour

3MD70F463B2674CBEF

3MD74CF0142B9016F9

(Hero's Hour)

Hero's Hour - 20% off - 11,99€

Redeem code

Hero's Hour discount code:

3MD713CF9414EE6CB4GOG

(remove GOG at the end of code to use it)

Another discount code for Hero's Hour (-20%):

3MD77B7D%8E%%7BEA8

% = C

The code expires on March 4, 2022, at 2 PM UTC.

Discount code for:

Alba: A Wildlife Adventure 50%
The Dungeon Of Naheulbeuk: The Amulet Of Chaos Standard Edition 50%
The Forgotten City Standard Edition 30%

https://www.gog.com/redeem/J6ACTC9MV7WPWN4XJgog3
(Remove "gog" - offer ends in 20hs)

Hero's Hour -20% OFF.

Code: 3MD742@@CB8@@2B23F

Replace @ with the result of the mathematical operation.

* @ = √81

Note: The offer ends on March 4th, at 2 PM UTC.

==========================================
Other discounts on GOG
==========================================

1. The Dungeon Of Naheulbeuk: The Amulet Of Chaos | -50% OFF.
2. The Forgotten City | -30% OFF.
3. Alba: A Wildlife Adventure | -50% OFF.

Code: J6ACCGOGT3LTMWPALCT94

* Remove: GOG.

Note: Code expires on Mar 3, 2022, 8:00 AM.

Here's another discount code for Hero's Hour:

3MD7427E82CC98144F

Here's a spoiler for Hero's Hour:

It is actually Hero's 51 Minutes once you take out the advertisements

3MD7877**3AE136086.

Insert the number to redeem the 20% off discount.

A lot of discounts lately; this one is for the Spellforce Series, good through March 6. It gives 80% off of Spellforce, Spellforce 2 (Anniversary Edition), Spellforce 3: Soul Harvest, and Spellforce3: Reforced, as well as 45% off Spellforce 3: Fallen God. Note that afaict this means that the discount doesn't include Spellforce 2: Demons of the Past or Spellforce 2: Faith in Destiny. So just remove 2 expansions from the code below if you want any or all of the available discounts.

A6QNFHCK92 expansionsFTXPAUATT

Spellforce series
https://www.gog.com/redeem/A6QNCHTTH7WT9T9RRA

Another discount code for Spellforce series:

A6QN4N4NFWJY9RWC7LGOG

(remove GOG at the end of the code to use it)

Spellforce series
A6QN4C47NHUCEVNVPY