Beating call of duty world at war on veteran difficulty. Beating serious sam :HD first & second encounter on serious difficulty. Beating DOOM & DOOM 2 on ultra-violent difficulty. Beating Dead space 2 & 3 on hard core difficulty.(Dead space 1 doesn't have hard core) Playing payday 2 on one down difficulty. Beating almost every halo game on legendary difficulty. I can keep going if you want.