Follow clues to discover hidden secrets and amazing spots in the city of Porto. Walk on the Old Town's iconic cobbled-stone streets and enjoy amazing views of the city while you solve challenges. Play the game by solving each piece of the puzzle on your smartphone, guess the answer to unlock the story of each secret place. Untangle the past and learn about Porto's history and its nickname as the Invincible City. Explore the city and be given exact directions so you won't need a map, GPS, or guide. Play offline as you don't need an internet connection to play the game. Enjoy as a group and solve the clues together as you walk, or split into smaller teams and compete against each other. Go at your own pace as there is no time limit, the game however can be completed in just over 1 hour. Play without a guide, just download the app, go to the starting point, and begin the adventure.