The listing, Trine 2 Complete - steam key has ended.
http://store.steampowered.com/app/35720/
retail price is $19.99 in the steam store
Trine 2 is a sidescrolling game of action, puzzles and platforming where you play as one of Three Heroes who make their way through dangers untold in a fantastical fairytale world. Join Amadeus the Wizard, Pontius the Knight and Zoya the Thief in their adventure full of friendship, magic and betrayal.
I will send you the key to redeem via Steam through Listia's contact link after the auction is over. You do have to have Steam installed to use this key for this game.