Hi

I just wanted to know,where you can see which games you can unlock after purchasing some games.Can you do this all the time?Lg

I'm not entirely sure what do you mean by that, but perhaps this thread would answer your question:
https://www.gog.com/forum/general/bonus_games_included_in_gog_games_v2

I watched angry joe and he purchased some games to unlock a free game

GOG does promotions like that during big sales, there's nothing like that running at the moment. When they are doing that you'll know because it's prominently featured on the front page.

Thanks yeah thats what i thought.Just one more question....If someone answered your question can you mark it?

You could if you had created the topic as a question topic