I would like to introduce you my new app called Ψαξε βρες(Search and find). It's a puzzle - riddle game that you need to search qr at town, search locations or solve classic riddles in order to complete quests. A qr treasure hunt discovering Athens. Till now it supports only Greek.
https://play.google.com/store/apps/details?id=com.dreamon.psaksevres
https://play.google.com/store/apps/details?id=com.dreamon.psaksevres
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