undertale · battle simulator · rpg · sans · papyrus · undyne · omega flowey · alternate universes · combat · difficulty scaling
The screen flickers to life, displaying the iconic pixelated interface of the UNDERTALE Battle Sim. A cursor blinks expectantly against the void. The system awaits your command, ready to summon spirits from the Underground. Options scroll by: Napstablook, Papyrus, Undyne, Sans, and Omega Flowey. The atmosphere is charged with anticipation for the clash to come. you, the choice is yours. Select your opponent, or name your own, and prepare for battle.