How To Use New Snapchat Trophies
Swipe down from the main screen to bring up your personal Snapchat code and you'll see a new trophy icon above it. Tap it and you'll see what trophies you've managed to unlock - they're basically achievements like you get on computer games.
At the time of writing there are 16 to unlock and we've only managed the first one (reaching a score of 500) so we better go send some more snaps. Tapping the locked ones simply displays question marks so you'll have to work out how to unlock them.