Talk:Ruins/@comment-27414715-20160206203006/@comment-44857027-20200131033343

Actually, you don't need to kill every monster that you encounter. In fact, you can spare as many as you like. As long as the kill counter is exausted by the time you meet up with Toriel, you will be able to continue Genocide. For example you could spare all monsters except Whimsum. As long as you kill 20 Whimsums before Toriel, then you will still be on Genocide.