"Larissa Treasure Hunt" is an interactive digital game that allows young and old to participate individually or in groups in hidden treasure games organized under the auspices of the Municipality of Larissa. In order to participate in a game, it is necessary to register in the application by creating a new account. The objective of the game is to solve all the available puzzles within the predetermined duration. Solving each puzzle consists of two (2) steps: (a) answering a knowledge question and (b) approaching the point indicated by each puzzle in order to scan the special identifier (QR code), which will be placed next to it. When all puzzles are solved, participants can claim the game prize, if any.