Modern Zorker writes, "Spot-the-difference games are different from hidden object titles in that we usually start playing them when we’re very young. Concepts like “which one doesn’t belong?” get introduced to children at around 3 or 4 years of age, and they progress in difficulty from there. Hidden Differences: Moonlight takes this concept to the next logical step, placing a tenderhearted story, told without a single word of dialog, around the idea of spotting the differences between a pair of seemingly-identical images. Simple? Yes, but still effective."