Bad Time Simulator

Bad Time Simulator puts you in the heart of one of the most iconic and brutal boss fights in gaming history—the Sans battle from Undertale’s Genocide Route. Known for its intense difficulty and emotional impact, this fight challenges even the most experienced players with lightning-fast reflexes, unforgiving patterns, and a deep connection to the game’s themes of morality and consequence.

If you’re up for an even harder challenge or want new features and enhanced gameplay, don’t miss out on [Bad Time Simulator 2]!

How to Play Bad Time Simulator

In Bad Time Simulator, your mission is simple in theory—defeat Sans. But that’s easier said than done. Sans attacks with a wide range of unique, rapid-fire moves that demand precise timing, fast reaction speed, and strong pattern recognition. He dodges all your attacks until the very end, making survival the name of the game.

Unlike other Undertale battles, this fight requires you to memorize attack sequences, dodge non-stop, and use healing items wisely. It’s less about brute force and more about mastering the rhythm and flow of the battle.

If you're not prepared... you're going to have a bad time.

Controls for Bad Time Simulator

• Arrow Keys / WASD – Move your soul during attack sequences
• Z – Confirm or interact
• X – Cancel or go back in the menu
• Enter – Start the game or interact with certain UI elements

Features

• One of the most challenging boss fights in indie game history
• Fast-paced and strategic gameplay that tests your reflexes
• Iconic soundtrack ("Megalovania") that adds to the intensity
• High replay value through pattern recognition and skill improvement
• A faithful fan-made experience based on Undertale’s Genocide Route