BAD TIME SIMULATOR

Bad Time Simulator is an unofficial Undertale fan game that lets you jump straight into one of gaming’s most infamous challenges: the Sans boss fight. You’ll dodge bones, Gaster Blasters, gravity attacks, and brutal patterns that demand quick reflexes, precise movement, and plenty of patience. It looks simple, but surviving even a few minutes can feel like an achievement. With tight controls, pixel-art visuals, relentless difficulty, and incredibly satisfying progression as you memorize each attack, Bad Time Simulator is perfect for Undertale fans who want to test their skills without replaying the entire Genocide Route.