Let me guess...
First the ones I know for sure:
Biggest square that only excludes the Vatican and Belarus: Council of Europe
Yellow one with Switzerland, Iceland, Norway and Liechtenstein: EFTA
The one with all the Nordic Cross flags: Nordic Council
The purple one with Poland, Hungary and former Czechoslovakia: Visegrand Group (Not sure if I spelled that correctly)
Big light blue square: European Union
Big light green square: Eurozone
The one with all the Benelux countries: Benelux Union, obviously
Red square including the EFTA + all EU members except for Ireland and Cyprus: Schengen Area
Big purple one including all the EFTA members + all EU members except for Croatia: European Economic Area
And now the ones I've no idea about:
The one with the three Baltics: Baltic Council? Baltic Union? Dunno but must be something like this
The orange one with the microstates + Turkey: Mmmm... Countries with some sort of treaty with the EU? Non-Eurozone Euro users can't be otherwise Montenegro and Kosovo would be there so it must be some sort of special tretment with the EU for non-EU members
The one with al the Balkan countries except for Bosnia, Montenegro and North Macedonia (I miss the FYROM days
) but somehow includes Ukraine, Georgia, Azerbaijan and Armenia: Countries the EU has stated that fit the geographical requirements to eventually apply for the EU? Balkan Union? Balcano Fantástico? Anyways, some sore of pan-Balkan organization that failed at incorporating these three Balkan countries but weirdly incorporated non-Balkan countries because even their transnational organizations have to end up balkanized anyways
The one with Georgia, Ukarine, Azerbaijan and Moldova: I can't come up with anything other than countries the EU would like to annex but can't or Russia would be really *urinated* off.
The one with Ireland and the UK: Some sort of
ad hoc organization that was created due to either the Good Friday Agreement or Brexit we continentals are too continental to comprehend.
The dark blue one with some Balkan countries in it + the UN: At first I thought it must be something related to the Balkan wars but then I realized that North Macedonia and Moldova are also part of it as well so I have absolyutely no idea what this might be
The one with Russia and Belarus alone: It must certainly be the democracy-hating anti-West club.