Ganni1987: This is just a heads up/reminder for those who don't know, or simply forgot some games even have them.

Sometimes a game may come with a Serial Key(s), these codes are not mentioned in the game's page so it's easy to miss them. They can range from game gift codes, multiplayer access and sometimes even redeemable content on other sites (such as the Witcher 3's comic on Darkhorse).

To find out if a game has a serial key simply go to your account: https://www.gog.com/account > click on a game > select 'More' and if has a key it will show a "Serial Keys" option in the drop-down menu.

EDIT: It seems I tripped in the thread's title: It should have been "A Note about Game Serial Keys on GOG". :-) my mistake

bhrigu: It would be great if someone can make a list of these "bonus serial keys" (that's seems to be a good term).

The one instance I know : Vanishing of Ethan Carter contains a bonus serial key for the redux version of the game.

drmike: [...]

bhrigu: It would be great if someone can make a list of these "bonus serial keys" (that's seems to be a good term).

The one instance I know : Vanishing of Ethan Carter contains a bonus serial key for the redux version of the game.

phaolo: Magog reports these games with serials or Gog messages:

[url=http://www.an-ovel.com/cgi-bin/magog.cgi?ver=912&scp=gdspurioc&dsp=ipgfsorcmDKP&ord=t0&flt=Dhs~1~&opt=n&myf=MonJan220048452018_uBbvTKCV2O9as]link[/url]

(I don't know what trick is required to enable links on Gog now *rolleyes*)