The main character of the game is a boy named Frisk. And he has a really serious mission in this episode – he will have to kill the monsters in the underworld. Otherwise, they threaten to break to the outer world. There is one rule you need to strictly follow - to kill ruthlessly, not giving a chance to a single monster on your way. At each level, you will deal with a growing number of monsters. You must learn to act as fast as possible. Get ready to meet the main boss at the very end and also eliminate him.