If you have ever seen or played one of these Megatouch coin-op video games before, usually found in bars and restaurants, then you're probably familiar with a game on it called PhotoHunt. The game presents you with two identical appearing photos, placed side by side, with one of the photos having been modified in five (5) locations using an image manipulation program such as Photoshop. The object of the game is to locate the differences between the two photos, playing against the clock, by touching the screen in the locations where the photos differ. As long as you find all five, then you move on to the next set of photos. Your score is calculated based on how quickly you point out the differences plus a bonus for each hint you do not use. You start with 3 hints. If you can't find a difference, you can keep playing by giving up one of your hints. It is a really fun game to play cooperatively, especially in a bar with some friends around.
As luck would have it, I found a Flash version of the game on a website in China, called Differences. The game takes a significant time to load, so give it time and your patience will be rewarded.
Caution: Since reviewing this game in 2004, the authors have changed the content of the images used in the game to some that are potentially NSFW!