You will play for baby Frisk, who accidentally got into the underworld. This place is inhabited by various monsters. Some of them are quite friendly, but others are more than aggressive. But luckily, you can kill any of them. When you are fighting with these creatures, your capabilities increase. All characters including the main hero have a level of health, attack and defense. But there are different ways to restore your health. Choose one of a few plot developments and get out of this scary place.