I know that there is a counter for the amount of kills on the stats menu. I know how to open "file0" to hack my location and items. All I need to know is where in "file0" is the kill counter to change a property to (insert amount of kills needed to have Sans ask if I want a bad time here), the codes for the items needed (I already hacked the real knife into the game), and the room code for Sans' bossfight.
(I'm not very good at making "complete" questions yet so edit if you think something I said was unclear)