Hotline Miami 2: Wrong Number - Apocalypse Hard Mode + Ending
Final level for this game, not too difficult.
Gameplay aside, the story for this game is quite hard to understand unless you arrange it, and then you can fully understand the story.
Here's the full story for the game, great video made by Squatch
HM1: • Hotline Miami 1 Story Summary
HM2: • Hotline Miami 2's Story Chronologically
Spoilers tho.