Bad Time Simulator
Bad Time Simulator or Sans Fight is a fan-made Undertale game where you go up against Sans in a brutal boss fight. Bones fly at you, Gaster Blasters cut across the screen, and your heart has to survive it all as the attacks keep coming.
The hard part is finding a safe spot before the next wave hits. One bad move costs health, so reading Sans's patterns matters just as much as reacting fast.
How To Play Bad Time Simulator
Move your heart with the arrow keys or WASD, depending on the version. Watch what's coming and slide toward open gaps before they shut.
Red soul mode lets you move freely. Blue soul mode adds gravity. If Blue Soul keeps tripping you up, tap short movements instead of holding a direction.
Use the battle menu to pick Fight, Act, Item, or Mercy when they're available. Don't burn healing items early save them for when you're actually in trouble.
Where Do Players Get Stuck in Bad Time Simulator?
Getting Trapped Between Bones and Blasters
Bones box you in while Gaster Blasters tear through the gaps there's barely anywhere left to stand.
Tip: Find the closest safe gap and take small steps. Sprinting across the arena gets you killed.
Misjudging Blue Soul Gravity
Blue soul mode changes how your heart moves. Hold a direction too long and you'll launch straight into an attack.
Tip: Practice with short taps until gravity and movement feel natural.
Losing Health Too Early
Tiny mistakes drain your health before the hardest attacks even start.
Tip: Learn the early patterns cold, and hold your healing items for later.
Who Might Not Enjoy Bad Time Simulator?
Bad Time Simulator isn't for everyone.
- Players who hate retries: Learning Sans's patterns takes patience.
- Players who want exploration: This is boss fights, not Undertale's bigger world.
- Players overwhelmed by fast action: Bones and laser beams come at you quick.
- Players who want an easy win: you won't get one here. Surviving takes reps and clean movement.
If you like tough challenges, use Practice Mode to learn the hard attacks before running the full fight.
Ready To Face Sans Fight?
Play Bad Time Simulator and see how long you last against Sans's attacks. Focus on one pattern at a time, watch for the safest gaps, and don't let a failed attempt stop you from going again.
