Fairly new to the casual game scene, I actually played the sequel first, then found this original game, which I just finished. Following his grandfather's clues, our hero travels to Cairo, Prague, Paris, and London via the rails. There are multiple HO scenes in each city, as well as on the train rides between cities. In each 'chapter' there are also puzzles/mini games, which I found to be hard enough without being ridiculously hard. Several times I had to resort to a walkthrough peek, but mostly I got it done without. Overall, I found this game to be just right as far as challenge level and number of HO scenes, even if the graphic quality was a bit old. The number of puzzles/mini games should keep adventure gamers happy, as well as those into HO games. The fact that there is a sequel (The Serpent of Isis: Your Journey Continues) is a definite bonus--especially since the sequel is even better!