Found this key sitting unused in my Humble library. Since I already have this game on Steam I thought it would make a good giveaway.

Also, btw: For another 1d19h you can grab Tropico 4 for FREE in the Humble store! Grab your copy now if you don't have it: https://www.humblebundle.com/store/tropico-4-free-game

Trine 2 is a sidescrolling game of action, puzzles and platforming.
You play as one of the Three Heroes who make their way through dangers untold in a fantastical fairytale world.
Physics-based puzzles with fire, water, gravity and magic; Wicked Goblins; Climb the tallest trees and towers in the enchanted forest!
Join your friends in the adventure: Trine 2 has online co-op.