Hardest game you've ever beaten?

[VGPolyglot]

Carl2291 said:

Boutros said:
Modern Warfare on Veteran was brutal especially that last mission in the plane gawd.

Fun fact, the guy who owns my local game store was missing this achievement and he made a challenge that whoever managed to get him it got £20 credit to spend on whatever they liked.

Each person got one turn and had to pass the controller. I went 4th, did it first try. 

I'm now an in-store legend.

So, what'd you buy with that money?