Bad Time Simulator
Stronger Than You
UT10 Battle - Undertale 10th Anniversary
Deltarune Chapter 3: Mike's Big Showdown
Deltarune Battle Simulator
Undertale Yellow Meta Flowey Fight
Undertale Yellow Zenith Martlet Fight
Undertale Yellow Ceroba Fight
Undertale Yellow Decibat Fight
Megalomaniac Sans Fight
Unfair Undyne v0.99
Bad Monday Simulator
Undertale AU Collecter
Multiplayer Undertale Fight
Undertale: Rejuvenation
Undertale Flowey Boss Fight
Deltarune
Jevil Fight
Jevil Fight 2-Player
Berdly Fight
Isaac vs Roaring Knight
Queen Fight
Wild Card Deltarune
Bad Time Simulator with Settings
Bad Time Simulator Easy Mode
Bad Time Simulator Hard Mode
Bad Time Simulator No Hit
Bad Time Simulator Horrortale
Undertale Last Breath
Horrortale Sans Fight
Inktale Sans 2-Player Battle
Underfell Sans Fight
Endless Sans
Undertale Sans Fight
Sans Fight Simulator
Dual Sans Fight
Bad Time Duo
Bad Time Trio
Bad Time Trio Simulator OG 2 Player
Swift Bad Time Trio
Swap Time Trio
Infinite HP Swap Time Trio
Bad Time Trio Fight
AU Trio Fight
Friday Night Funkin vs Sans
Lucas Battle
Sir Kain Battle
Undyne Fight
Papyrus Boss Fight
Mettaton EX
Gaster Fight
Asgore Fight
Undertale Scene Creator
Undertale Personality Quiz
Undertale Music Player
Bad Time Simulator | Sans Fight & Undertale Boss Battles
Game Overview
What is Bad Time Simulator?
- •Authentic recreation of Sans' fourth-wall-breaking dialogue and personality
- •Two-phase battle system with escalating difficulty and unique mechanics
- •Blue soul gravity mechanics that change movement physics mid-battle
- •Karma damage system that punishes players based on their Undertale choices
- •Frame-perfect timing requirements that test true gaming precision
How to Play Bad Time Simulator
- •Normal Mode: The classic Sans battle experience in Bad Time Simulator. Dodge attacks and try to defeat Sans. You'll return to the menu automatically if you lose.
- •Practice Mode: Hone your Bad Time Simulator dodging skills without pressure. Note: attacks loop indefinitely—refresh the page to exit.
- •Endless Mode: Select Phase 1 or Phase 2 for an escalating challenge that tests your endurance against the increasingly difficult patterns of the simulator.
- •Single Attack: Master specific patterns by choosing from 24 different Sans attacks. Great for targeting your weaknesses or starting with simpler patterns in Bad Time Simulator.
- •Custom Attack: Load File: Import attack patterns created by the community; Documentation: Access creation instructions (unlocks after loading a file); Run Attack: Test custom patterns (available after loading a file)
- •Use Single Attack mode to practice specific patterns you struggle with
- •Stay centered during bone attacks—most patterns are designed around middle positioning
- •In blue soul phases, jump timing is crucial—tap up arrow briefly, don't hold
- •Focus on Gaster Blaster warning signs—they telegraph direction before firing
- •Try unlimited HP versions first to learn Bad Time Simulator attack patterns without pressure
FAQ
Sansgaylover
No gay sans? 0 stars>:(
Xander
Where's the Megalovania song bro
Frisk
sans I'm bored and if you don't come here to play with me I'm gonna do a genocide route
Oh Jesus Christ NO.
NO HUMAN! VIOLENCE IS NOT THE ANSWER!!!!!!!!!!!!!!!!!!!!!!!!!!
OK
btw i have a playdate with Asriel at 3
ok
Charles
Yawn, this is too easy. I can no hit this like it's no big deal
sans
hi bro
hi
WHY ARE YOU HERE? YOU SHOULD BE AT YOUR POST IN SNOWDIN! NOT PLAYING WITH YOURSELF!
Um, Papyrus? That sounds a little weird.
THAT'S NOT WHAT I MEANT!!! Ugh, just come back to Snowdin! Undyne's worried about you fighting yourself endlessly!
Yeah, Paps is right. SO GET YOUR LAZY BUTT OFF THE COMPUTER OR I'LL COME OVER THERE AND DRAG YOU OUT OF THE HOUSE MYSELF!!!!!!!!
Uh, after a put on a coat.
Uh, after I put on a coat.
Oops, sent it twice.
Why do you need a coat?! You are wearing a hoodie for god's sake!
...What? I don't have a hoodie. HOODIES ARE THE POOR MAN'S JACKET!!!!! I DON'T SKIP THE EXTRA STEP OF USING A ZIPPER!!!!!! THAT'S FOR LOSERS!!!!!! NGAAAAHHHH!!!!!!
UNDYNE! WHY ARE YOU USING MY ACCOUNT???
Oops! Sorry, Papyrus.
shut up you niggers niggas in trying to sleep
Stronger Than You
UT10 Battle - Undertale 10th Anniversary
Deltarune Chapter 3: Mike's Big Showdown
Deltarune Battle Simulator
Undertale Yellow Meta Flowey Fight
Undertale Yellow Zenith Martlet Fight
Undertale Yellow Ceroba Fight
Undertale Yellow Decibat Fight
Megalomaniac Sans Fight
Unfair Undyne v0.99
Bad Monday Simulator
Undertale AU Collecter
Multiplayer Undertale Fight
Undertale: Rejuvenation
Undertale Flowey Boss Fight
Deltarune
Jevil Fight
Jevil Fight 2-Player
Berdly Fight
Isaac vs Roaring Knight
Queen Fight
Wild Card Deltarune
Sansgaylover
No gay sans? 0 stars>:(
Xander
Where's the Megalovania song bro
Frisk
sans I'm bored and if you don't come here to play with me I'm gonna do a genocide route
Oh Jesus Christ NO.
NO HUMAN! VIOLENCE IS NOT THE ANSWER!!!!!!!!!!!!!!!!!!!!!!!!!!
OK
btw i have a playdate with Asriel at 3
ok
Charles
Yawn, this is too easy. I can no hit this like it's no big deal
sans
hi bro
hi
WHY ARE YOU HERE? YOU SHOULD BE AT YOUR POST IN SNOWDIN! NOT PLAYING WITH YOURSELF!
Um, Papyrus? That sounds a little weird.
THAT'S NOT WHAT I MEANT!!! Ugh, just come back to Snowdin! Undyne's worried about you fighting yourself endlessly!
Yeah, Paps is right. SO GET YOUR LAZY BUTT OFF THE COMPUTER OR I'LL COME OVER THERE AND DRAG YOU OUT OF THE HOUSE MYSELF!!!!!!!!
Uh, after a put on a coat.
Uh, after I put on a coat.
Oops, sent it twice.
Why do you need a coat?! You are wearing a hoodie for god's sake!
...What? I don't have a hoodie. HOODIES ARE THE POOR MAN'S JACKET!!!!! I DON'T SKIP THE EXTRA STEP OF USING A ZIPPER!!!!!! THAT'S FOR LOSERS!!!!!! NGAAAAHHHH!!!!!!
UNDYNE! WHY ARE YOU USING MY ACCOUNT???
Oops! Sorry, Papyrus.
shut up you niggers niggas in trying to sleep