The Showdown level of Hotline Miami was brutally hard.
Learning to beat panthers to death was an extension of what you've learned about dealing with dogs. However to defeat the ninja you need to do two moves in quick succession perfectly. I had guessed one of the moves but I needed to go to an online FAQ to confirm that I had the right idea but was failing to execute it.
And then it turns out that you're only halfway through the game!