I've rated several in the series 5 stars. Great game in all respects. Game play, graphics, sound, and puzzles need no explaining. Not overly difficult, yet satisfying when accomplished. Storyline is short clips that don't interrupt the mood of the game which is compelling and imersive. No unwanted ads to remind you of the greed of other devs and the fun it ruins. You can finish for free, with a bonus chapter in each game that is pay to play which gives you the collections for more bonus games.