Trine 2: Complete Story, a 2D platformer built by the Frozenbyte studio, can now be purchased on Steam with an 85% discount for a limited amount of time.The Frozenbyte developers have released a new version called Trine 2: Complete Story.
The original Trine (2009) first became notable to me after I had discovered that its developer Frozenbyte had given full permission to redistribute screenshots of the game under a Creative Commons license as long as an attribution back to them was preserved.
This is the code to get into the Beta. "TrineEEBeta2014" Enter it into the Beta opt in of the properties for the game. Make sure that you choose to use the Beta in the drop down box. 1.2GB download and you're set. Remember to give them some useful feedback on the forums!