Solving optical illusions that hide mistakes is like navigating a tricky ... These visual conundrums consist of images or patterns adept at manipulating our eyes and brains. Who knows, you might even ...

The illusion has gone viral across social media, and feaures two cartoon faces. So, what colour do you think the faces are?

You have the sharpest eyes if you can find the missing gatekeeper in the picture in 7 seconds. Test your eyes now!