We signed up, expecting an ARG to take us around the streets of Prague in a search for the Holy Grail... because of the vast history contained in this city, there is plenty to draw from to weave a compelling historical narrative into an Alternate Reality Game. Instead we got a series of text messages, devoid of any overarching context, taking us directly to the next place.
Because of this, after the first few clues, it was hard to stay motivated. It was just a string of randomness with no overarching goal.
The "game" took us to interesting tourist spots, but did not integrate the history, stories, and lore of those locations into the game. So, while we visited tourist locations, we didn't get any of the information of those places through game play.
Overall, it was a long walk, and we paid A LOT OF MONEY... 88 Euro.
Totally NOT worth it. Just go to the Lesser Town (Mala Strana) and aimlessly meander. It won't cost you anything, and you'll have the same experience.