SPOILERS AHEAD! No kidding, in this project are spoilers. you should play V1 and Undertale first before V2 or else you're not gonna know what the heck you need to do and you might have a bad time. No way to get negative health this time. If you want to change something or borrow any sprites from here click see inside. Press Z To attack Sans (when his health is 0 it goes back to 1). Press C to spare Sans (his health goes up). Pressing C or Z on Fight or Mercy will still count as fighting or sparing Sans. Yeah, I can't fix this.