You can grab Quantum Conundrum at Gamefly,
http://www.gamefly.com/Download-Quantum-Conundrum/5004188/
Use coupon 1GFT82012
This is a Steamworks title so should activate on Steam.
http://www.gamefly.com/Download-Quantum-Conundrum/5004188/
Use coupon 1GFT82012
This is a Steamworks title so should activate on Steam.