Sherlook (2017)

In Sherlook, players examine two nearly identical images that have only minor differences between them. Everyone uses their powers of perception to determine how many anomalies there are before the other players can. The faster they can figure it out, the more points they earn — assuming they're right!

Sherlook contains forty images, each with only slight differences from one another, so that players can return to the scene of the crime again and again.