The Book of Desires is a typical HOG, though one that puts a massive emphasis on puzzle solving. Instead of simply solving hidden object scenes to progress the plot, you also need to gather up items and use them at the correct times and places as you explore the game's world. There are also puzzles you are occasionally asked to solve in order to proceed, but these can be skipped. There are two difficulty levels, but the only real difference between them is a shimmer effect for active objects and how quickly the hint timer charges up.