Serious Sam 3 Last Boss
I had no idea how insane this game was until I reached the starting point of this level.
Hordes and hordes of enemies come swarming at you in a long trench. I think I must've killed at least 3000 or so before I said "Screw this shit, I'll storm through it all".
And then the boss fight happened. Holy crap, this shit was epic. But really fucking hard. I think I died 20 or so times before I managed to pull it off. Figured I record this feat for public viewing... So there you have it. Final boss of Serious Sam 3.
To think that I had difficulty with this game on Normal either means I'm a fantastic wuss at old school games or this game is really fucking unforgiving.