If you're missing the endless frustration of dying over and over in Dark Souls, and can't wait until the third entry in April then you might want to give Slashy Souls a try.
It's a mobile game which is not really that similar to Dark Souls but acts as a tie in promotion to remind everyone that the main game is coming out soon. The whole thing unfolks as an endless runner with very basic controls and a ton of enemies to try to slash before the screen automaticall kills you.
It doesn't look very good.
Still at least it's utterly free and on iOS and Android now. And it will make sure that the graphics in the actual game look even better by contrast. Dark Souls III is out on PS4, Xbox One and PC from the 12th of April 2016.