Sans Fight: Bad Time Simulator
Sans Fight: Bad Time Simulator is a fan-made online game that recreates the infamous final boss battle against Sans from the indie classic Undertale. Known for its intense difficulty, this fight challenges players to survive wave after wave of creative and unforgiving attacks. Every move counts — one mistake could mean starting all over again. The simulator faithfully mirrors the original battle's chaotic bullet-hell style, giving both longtime fans and newcomers a chance to experience the thrill of dodging bones, blasters, and gravity-flipping traps in real-time.
To play, simply use your keyboard’s arrow keys or WASD to move your soul (the red heart) inside the small attack box. Your goal is to avoid all incoming attacks and stay alive as long as possible. The game requires quick reflexes, sharp focus, and lots of determination. There are multiple modes available, including Practice Mode for learning the patterns and Normal Mode for taking on the full fight. Whether you're training to become a master or proving your skills, Sans Fight offers a fast-paced and rewarding experience — no downloads required.
How to have a bad time simulator?
[Z] - Fight
[X] - Confirm
[Alt + F4] - Quit
[F11] - Fullscreen
When HP=0, you lose.
How to play | FAQ | About
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How to Play Sans Fight?
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1. Start the Game
Go to the website and click the "Start" button to launch the Sans fight. Turn up your volume for the full Undertale-style experience.
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2. Master the Controls
Use the arrow keys or WASD to move your heart (soul) around the box. Your goal is to dodge incoming attacks like bones and lasers.
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3. Survive the Battle
The longer you last, the harder it gets! Keep practicing your reflexes and memorize patterns to defeat Sans and survive the bad time.
Frequently Asked Questions
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What is Bad Time Simulator: Sans Fight?
Bad Time Simulator is a fan-made browser game that recreates the challenging Sans boss fight from Undertale. Players must dodge a series of fast-paced attacks to survive as long as possible.
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How do I play Sans Fight online?
Simply visit the Bad Time Simulator website and click the "Start" button. Use your keyboard (arrow keys or WASD) to control your soul and avoid incoming attacks.
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Are there different difficulty levels?
Yes, the game usually offers modes like Practice and Normal, allowing you to either learn the patterns or test your endurance in a full fight.
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Can I play Bad Time Simulator on mobile?
While primarily designed for desktop, some versions may work on mobile browsers. However, for the best experience, it’s recommended to use a keyboard on a PC or laptop.
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Is Bad Time Simulator an official Undertale game?
No, this simulator is an unofficial fan project inspired by Undertale. It is not affiliated with or endorsed by Toby Fox, the creator of Undertale.
About Sans Fight
Sans Fight, also known as Bad Time Simulator, is a fan-made browser game inspired by the unforgettable final boss battle in *Undertale*. In this simulator, players take on the challenge of fighting Sans, one of the game’s most iconic and difficult characters. With fast-paced, bullet-hell style mechanics and no room for error, the game tests your reflexes, memory, and determination.
Designed for both casual fans and hardcore Undertale players, Bad Time Simulator recreates the intense combat experience using keyboard controls in your browser. Whether you’re reliving the nostalgia or taking on Sans for the first time, this simulator lets you experience what it truly means to have a bad time.