Princess Memo Game

How to play the game "Princess Memo Game"?

Psst, girls, it’s Lea! I’ve got a great surprise but you have to promise not to tell anyone, right? I’m throwing a surprise princess party for Lilou! She’s been busy with her blog and studying lately, so I thought she needed some fun! I’m decorating the whole flat like a fairytale! There’ll be crowns, castles, mirrors, glass slippers... but wait a minute, I’m missing some things! Can you find them all in this memory game!