The good and the bad
Good: 1st level good for learning the flags and flags are large enough to generally see the details well. I like the fact that it only shows 6 flags to choose from. Bad: 2nd level has pretty much all the flags and thus too many to conquer for learning. My suggestion is to use the Seterra app to at least learn the African and European flags before trying the second level. Also at this point in time the app needs an update as Swaziland has been renamed as Eswatini.