Challenge your observation skills! Find all 3 differences in two pictures of Girl Playing With Her Dog in just 21 seconds.

This is when you get to know your cognitive potential and mental alertness. Here we have a spot the difference quiz for you to check your vision, alertness, concentration and mental clarity.

What information do we collect from this quiz? With this in mind ... Will you reach the top and be CBBC's Eurovision Spot the Difference winner? Or end up languishing lower down with nul points?