Locking horns with a great puzzle is an almost zen-like experience. There's something wonderful about letting the world slip away as you sink into the pure logic of a mind-bending puzzle. Of course, when that puzzle is as beautiful and engaging as Quell Memento, it makes the experience that much sweeter. Created by Fallen Tree Games, the lastest installment of the raindrop-sliding brainteaser Quell takes place in an abandoned house, filled with the memories of its previous owner.

As far as puzzle games go, the simpler and the more mind-bending, the better. Quell takes that idea a step further and adds a shining, stylish visual package to the mix, encouraging you to keep playing not just because you're hopelessly addicted, but because you honestly enjoy staring at your mobile device.