6. Hotline Miami 2
Granted you could throw the original Hotline on here and it'd still fit, but it was with the second where developers Dennaton streamlined everything about the gameplay, introduced a bigger reliance on firearms for long-range kills and spread out the level layouts to force you to really learn every enemy placement in a given area to proceed. Some said it was for the worse, as suddenly they were getting shot from off-screen far too much - but the real beating heart of Hotline Miami has been in thundering through levels at a million miles an hour and racking up kills left and right, before taking taking the barest amount of breaths and charging forward before your combo window peters out. With a brilliant story that delves into the ramifications of the first game's main character becoming something of a celebrity, it provides a brilliant commentary on everything from media fascination to the imitative qualities more extremists then seek out by association - but to see it all you'll have to die a few thousand times learning exactly how to get through.