In bad time simulator, players control a small heart representing their soul while facing Sans, a seemingly laid-back skeleton whose attacks become increasingly difficult as the battle progresses. The gameplay focuses heavily on dodging obstacles such as bones, laser-like Gaster Blasters, and gravity-based attacks that force players to adapt to different movement mechanics. Unlike many action games that emphasize offense, Bad Time Simulator is largely about survival, testing a player's ability to remain calm under pressure while avoiding damage.