☠️GAME MODES
Master every challenge in the most authentic Sans Fight experience. From beginner-friendly practice to the ultimate Last Breath challenge.
[ START GAME ]Normal Mode
Relive the legendary judgment hall battle exactly as it appeared in the original Undertale Genocide Route. This mode features Sans's full dialogue and all attack phases, including the infamous "strongest attack" to start. It is the gold standard for players seeking the authentic challenge.
> KEY FEATURES:
- ▸Experience the complete story with all dialogue
- ▸Face all attack patterns in their original order
- ▸Prepare for the unexpected final attack
- ▸This is how the battle was meant to be fought
Practice Mode
Struggling with a specific move? Practice Mode allows you to skip the dialogue and select individual attacks to train against. From Gaster Blaster arrays to the complex platforming sequences, you can build the muscle memory needed to survive the final showdown without starting over.
> KEY FEATURES:
- ▸Choose any specific attack to practice
- ▸Skip dialogue and jump straight into action
- ▸Perfect your dodging techniques
- ▸Build muscle memory for difficult sequences
Endless Mode
For the masters of the bone-sliding art, Endless Mode offers a relentless, never-ending assault. The attacks become increasingly dense and fast-paced the longer you survive. Compete for the high score and prove your determination in the world's most difficult Sans simulator.
> KEY FEATURES:
- ▸Survive as long as possible
- ▸Attacks get progressively harder and faster
- ▸Compete for global high scores
- ▸Ultimate test of skill and endurance
Last Breath Mode
Inspired by the popular "Undertale Last Breath" fan-mod, this mode explores the timeline where Sans refuses to give up. It includes 3 unique phases with high-quality custom sprites, a remixed soundtrack, and devastatingly new attack logic that will push even veteran players to their limits.
> KEY FEATURES:
- ▸Experience 3 unique battle phases
- ▸Face custom attack patterns
- ▸Enjoy remixed soundtrack
- ▸The ultimate challenge for veterans
Single Attack & Custom Modes
Dive straight into the action with Single Attack mode to experience patterns one by one. Our platform also tracks experimental Custom Attack builds, allowing for a diverse range of fan-created challenges that keep the gameplay fresh every time you visit.
Single Attack
- ▸Experience individual attack patterns
- ▸Perfect for quick practice sessions
- ▸Ideal for learning specific mechanics
Custom Modes
- ▸Fan-created attack patterns
- ▸Fresh challenges every visit
- ▸Community-driven content
Ready for a Bad Time?
Experience all game modes completely free. No downloads, no registration required. Play directly in your browser with full keyboard support.
> START PLAYING NOW