You will not be in any way surprised to realise that finally there is a version of Halo for the Windows 8 phone and PCs and tablets.Halo: Spartan Assault is the name of the shooter which comes with, " A unique fusion of touch and consolelike controls for easy pick-up-and-play gaming, with the added flexibility of keyboard and mouse controls on Windows 8 PCs and tablets2", blimey. Obviously it also has in-app purchases otherwise, well, what's the point?
After all, if you couldn't "Grind to earn upgrades or speed up your training by purchasing credits for boosts, unique weapons or armor abilities", then you'd just have to play the darned thing.
Source:
343