Quantum Conundrum

http://www.youtube.com/watch?v=Qg97ZEkqhzE

Current selling price: $8.99

So imagine Portal, but instead of using portals to get around, you manipulate gravity, time, density, and various other things. QC is a game that will constantly test your mind, often to the point of frustration, but in such a way that you’ll keep coming back, especially for additional challenges. Especially if you’re a fan of puzzlers, this is a must have.