What common? description

What do you think that unites the words "man", "animal" and "treatment"?
It's just a set of words, say you and you're wrong, there is a connection between them, which you will understand after you play this game.
While this is not a very big game, but if you like it, we'll double the game.
- 12 levels and 240 words.
- Convenience of playing at night and daytime.
- Interesting and unusual puzzles.
- Play in seven languages: French, English, Russian, Spanish, Italian, German and Portuguese.
Before you three photos, you have to guess what word they are hiding, then answer the question what in common between them seems to be an easy task, then challenge the game and prove it?
Ready?
Then what are you waiting for?
Forward and good luck to you!