Sans is unique in that he is the most popular character Undertale while also providing one of the worst fights the game has to offer.
If you want to experience the spin of Genocide running without having to play through the entire game again, this “Bad Time Simulator” lets you face a cool skeleton dude. right in your browser. It’s a year or two old, of course, but it’s still neat. It even works on mobile browsers!
The cool thing is that it’s not just the fight. You can play through it as usual, for sure, but it also has a practice mode, an infinite mode, and it will even allow you to test your metal again against a single attack. I find this a great help to anyone trying to break Sans patterns.
I didn’t get very far but I’m sure it’s better Undertale players than me out there. Check out.