How do you get puzzle pieces?
I saw someone who had gotten puzzle pieces, but I don't know how.
Puzzle pieces are rewarded for doing translations in the Immersion tab at the top of the screen.
If you're a new user, this guide explains a lot about the site. http://www.duolingo.com/comment/1426103
This is a guide explaining Immersion: http://www.duolingo.com/comment/1276245
This one explains the community guidelines if you feel up to the challenge. http://www.duolingo.com/comment/984423
Hope this helped! :)