From Rovio Mobile:
What's new in this version:
Introducing: Custom Contraptions! Find new hidden loot crates every day to get new tricked-out parts for your contraptions. Plus throw scrap and duplicate parts into the Scrap Machine and get new, shiny parts in return! A HUGE amount of new parts Daily Loot Crates hidden in levels find up to three per day. New Scrap machine turn your extra parts into better ones.