Levels & unlocked itemsBy
The following gallery shows an image for all “new level unlocked” screens up to the current max level 69 (as of iOS version 1.5.0 and Android version 1.3.7.a – Valentine’s Day 2014 update)
The images show all the new items that are unlocked by reaching the level, but they only relate to the mainland. It is possible that there are more items unlocked in the other areas (i.e. Island, Mountain, Swoof Planet).
Gallery “Levels & unlocked items”