I understand that Sweden may not be in Eastern Europe but Finland and Greece definitely are and they have the same longititude as some countries in this quiz. As for Sweden it does have the same longitude as as one of the countries in this quiz...
I agree there is some confusion here as there is a set of countries defined as Eastern Europe, e.g. the Polish are classified as Eastern European. However this quiz (I believe) is talking about the Eastern half of Europe, in terms of geography, which is slightly different to the cultural version.
When you have maps and stuff, scroll mode works best on mobile phones. Scroll mode allows users to scroll sideways as well as up and down. To set those go to More Options in Step 1 and set Mobile Display: to Scroll.
Finland is Northern Europe, not eastern. Greece is Southern Europe, not eastern. Macedonia is called North Macedonia now, and Czechia should be accepted. Please correct the mistakes. Thanks!
https://en.wikipedia.org/wiki/Eastern_Europe
Some may disagree with the article but Sweden, Finland and Greece are definitely not Eastern Europe.