I Spy Castle
Very much like the I Spy books.
This game is really a lot like the I Spy book series. Besides being an interactive version of I Spy there is also an extra interaction that must be done in each puzzle, which in some is like a mini game or extra puzzle. If you have read and played with the I Spy books than you will know the difficulty level that this game is because it is about the same. I would also reccommend this game to casual gamers who like hidden picture games.