ULC Sans and Battle ULC Sans Gameplay! (Actually really good!) 

The true sans, and kinda ULC sans...

It was an old event for like 10 million visits, happened sometime last year, so it's unobtainable at the moment

When the game got 10M visits you could talk to old sans and complete the quest,the quest was "win with 15(i think)unremodeled characters"

@@jhordanpozo5046 Yeah it was win with 10-20 unremodeled or adrian era model characters