Hello,
I have question. How add "list" my games to the GOG 2.0?
Example: I hava lists my game in txt and add to the GOG (Manually added game)?

Can't do that, but I'm not sure I understand you.

I understand. I think it's possible because I see "Manually added games"?
github .com/gogcom/galaxy-integrations-python-api/blob/master/PLATFORM_IDs.md

I'm still not sure I understand but manually adding games (not linked to any platform) is not yet implemented.

I heard, but I thought I would add faster :)

Actually you can. But only from the Recently played by others in the community. Just click on them and a button "Mark as Owned" will appear and a posibbility to link an executable.

I think you can also write a simple plugin that reads out json files where you can input any game you'd like to add.
Actually I looked into it a little bit but since I never worked with python before and it's added eventually, I didn't finish it. But I think somebody more into it could write a plugin like that in 20 minutes and the only thing you would need to change would be the platform (as you can only add one platform for each plugin) and add the games and their infos in the json file.

Thank you very much for answer :)

Hi again!,
I found a way to add games from a second Steam account.

Simply duplicate the steam plugin and change its parameters in json and __init__ to another platform, for example: "Gamers Gate" and I change GUID (generate). :)

Works: adding games to the library and starting games (installation - don't work, achievements and hours of the game - from the main account with a duplicate game). I didn't check the others