18. Hiruko (Shinobi)
https://www.youtube.com/watch?v=9OYzYI0xzME By the time you reached the final boss of Shinobi, it was likely that you'd suffered numerous deaths and a torturous amount of restarts. The brutal difficulty of the game is something that was rare for the time period, which has seen a resurrection recently in the Dark Souls franchise. But where some players speak of their constant struggles against the baddies of Dark Souls, gamers who experienced this Shinobi rebirth in 2002 were mortal enemies with a certain man known as Hiruko, the final boss of the game. Hiruko was a troll, plain and simple, and he tested your patience like no other. His teleporting from one side of the level to another forced you to be on the move from the word go, never letting the battle quiet to anything less than pure chaos. Hiruko is a trial of focus and determination to the point where your victory is one of the most well-earned in all of gaming, as the jubilation you feel from slaying him is something that gamers will carry with them for a long time.