Matching game

I wrote the JavaScript code for this little game as an assigment for the course "HTML, CSS and JavaScript" taught by David Rossiter from The Honk Kong University of Science and Technology on Coursera. I have later restyled it using my own illustrations from the Groenduimpjes project and adapted it a little.

On the left side there is an extra bunny, can you find it?
Click on the extra bunny to play!