Who doesn't enjoy looking at two seemingly identical images and spotting the subtle differences between the two? Why, the last time I saw a pair of identical twins, I may have weirded them out when I crossed my eyes and murmured "Aha, the eyes don't quite match up, I better click on that." But luckily I paid my bail in time to catch 4 Differences, the latest installment in one of the finest spot the difference series out there.
The control scheme is pretty self explanatory. Look for places where Ivoryboy's gorgeous visuals don't match up, and click on them. The eye cross trick doesn't always work because sometimes the pictures are stacked rather than side-by-side, and sometimes they are mirrored.
Although this installment is just as beautiful as the previous 5 Differences and 6 Differences, it's lacking in some of the satire and symbolism that made 6 Differences in particular compelling. 4 Differences doesn't seem to have much to say; it's content just to show us some pretty pictures. The four differences in each scene are also the same every time you play through the game, which severely hampers replay value.
That said, this game is still miles above most other spot-the-difference games. Its visual presentation alone makes it worth a look. If you like the genre at all, you won't want to miss it.