If you’ve ever visited a European city for the first time and wondered where to start exploring, I have a suggestion that is going to make your day.

Secret City Trails is effectively an interactive, three-dimensional puzzle, where you follow clues and solve riddles as you learn about parks, buildings, art and architecture, and more, in a given location. Keith and I played in Riga, Latvia, when we were there last year for the Women in Travel Summit.

We walked through parks and by canals..

…and over narrow streets lined with boutiques and restaurants searching for clues, as we discovered fascinating nuggets of history along the way.

We also walked with purpose, because part of the fun is challenging yourself against the time others have taken to solve the same riddles of a given game. There’s no pressure–you can “stop the clock” for lunch or a shopping break–but if you’re at all competitive, it’s definitely an incentive.

Well, it’s no secret anymore. Heading to London or Paris, Lisbon or Amsterdam this summer? Check out the games in these and other cities in Europe. And to celebrate the inauguration of their 50th game, according to the email I received today, the first 50 people who sign up to play will receive a 50% discount on the already budget-friendly cost to play. For more information, just click here.

Have fun, and let me know how you like it!

P.S. I so fell in love with this concept that I’ve requested to create a game in a city here in Portugal that so far has no Secret City Trail. I look forward to sharing that with you when it’s up and running.