No More Heroes: Heroes' Paradise

The easiest way of obtaining this is by repeating Assassination gig 14 – Big Bang Anarchy over and over. In this mission you will get 2 minutes to kill as many enemies as possible. For every 5 enemies that you kill you will get 1 “dark side mode” charge. Consuming a Dark Side Mode charge ( + ) causes all the enemies around you to die instantly. You can easily get around 150 kills each time you clear this mission.