Infuriating puzzle challenges viewers to find the hidden objects in just 45 seconds - but how good is YOUR eyesight?

Challenge 1: The first image shows a deck of cards containing a hidden Mona Lisa face, but can you find it, above?
A surprisingly tricky puzzle has baffled internet users with its challenge to find the hidden objects.
The timed quiz gives users just 45 seconds to find one named objects in each of the four images and will test your eyesight to its limit. The first image shows a deck of cards containing a hidden Mona Lisa face, while the next asks users to uncover the 'smiling' dice among a sea of them. Meanwhile the third shows an array of Kings and Queens, with a Joker hiding among them. Lastly, a display of playing cards contains a hidden face with sunglasses, but only those with the sharpest eyes will find it. Richard Gargan, the spokesperson for website Casumo.com, said: 'Most people get at least two out of the four, but it's rare to get them all!'. But how many will you get right? Scroll down for the answers... but no cheating!
Find Mona Lisa’s face
Find the happy dice 
Find the hidden Joker
Find the face with sunglasses