Behind the sticker

Every level shows a different picture with a hidden element. Can you guess what it is?

✔ 14 Languages - English, Spanish, German, French, Dutch, Italian, Russian, Finnish, Polish, Greek, Czech, Lithuanian, Hungarian, Romanian
✔ More than 200 levels
✔ Interesting puzzles: from easy to really challenging
✔ Earn coins on easy levels to exchange them for hints on more complicated ones