The phrase "difference games" refers to a type of puzzle or activity where you compare two pictures or objects to find the discrepancies or changes between them. It's like a game of spotting the differences. Full definition
Aside from those minor differences this game is, essentially, the same; something with which I have no problem whatsoever. (stevivor.com)
The games are expanded with a spot - the - difference game between the jacket and the self - cover designs. (mediamikes.com)
This time they bring you a cool difference game where you have get the highest score possible by finding all the differences before the time runs out! (agame.com)