Open https://app.quizzingbee.com/v1/#/Quizzes/4/openWho and press on ‘Start’.

First I thought I make the quiz by showing the picture of a head of a country and then ask for the name. This is also an option. But without showing the picture upfront and instead asking via country, seems more challenging and fun.

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All in all this quiz contains ~150 questions, when answered it shows pictures of persons and gives background information – in different languages. Next to english also available in …
german “Staatsoberhaupt der Länder weltweit”
spanish “Jefe de estado de países de todo el mundo”
french “Chef d’État des pays du monde”
portuguese “Chefe de estado dos países do mundo”
russian “Глава государства стран мира”