Undertale Genocide run explained: How to play the game in the most evil way possible
Undertale Genocide Speedrun 1:27:43
Mat Hall Contributor Performing a Undertale Genocide run has you play the game in the most evil way possible - by killing everything in your path. Which, ironically, is the way you play most normal role-playing games. The Neutral and Pacifist endings are both very similar in terms of outcome and what needs to be done to achieve them, but saving everyone and solving the mysteries are not the only way to get things done - you can always kill everyone instead.