Difference games, also known as Spot the Difference, are one type of puzzle game that challenges players to find differences between two similar images. The concept of finding subtle differences between the two images is simple, but the level of difficulty is highly variable. While some of the differences may be quite obvious, there may also be some that are much more difficult to spot. This makes the game both engaging and addictive, as players try to figure out what the differences are while they are in a race against the clock.