The main objective of bad time simulator is to survive Sans's relentless attacks. Players control a small heart that represents their soul and must dodge a variety of projectiles, bones, lasers, and other obstacles. The battle closely resembles the original encounter from Undertale, making it a nostalgic experience for fans of the game. At the same time, it introduces players who may not have played Undertale to one of gaming's most iconic boss fights. One of the game's greatest strengths is its difficulty. The attacks require quick reactions, precise movement, and strong concentration. Many players spend hours practicing to improve their performance and survive longer against Sans. This challenging nature creates a rewarding experience, as overcoming difficult attack patterns gives players a strong sense of accomplishment.