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Bad Time Simulator is a fan-made game inspired by the iconic Sans boss fight from Undertale, the indie RPG created by Toby Fox. Known for its punishing difficulty and faithful recreation of the original battle, this browser-based game lets players face off against Sans, the laid-back skeleton with devastating powers, without needing to play through Undertale’s Genocide Route.
In Bad Time Simulator, players navigate a small battle arena using arrow keys (on desktop) or touch controls (on mobile) to move the red heart. The goal is to survive Sans’ 24 distinct attack patterns, split into two phases: 13 in the first and 11 in the second, with the latter being more complex. Attacks include bone slams, Gaster Blaster beams, and shifting gravity zones, requiring precise timing and pattern recognition.
A unique feature is the blue and white bone system. White bones damage the player on contact, while blue bones only hurt if the player moves through them. This forces strategic decisions about when to stay still or move, adding depth to the already demanding gameplay.
Sans manipulates the player’s soul with different modes, such as blue soul mode, which introduces gravity, making the heart fall or jump slowly. Mastering these modes is critical to surviving the onslaught of attacks.
Bad Time Simulator offers multiple modes to cater to different skill levels:
Normal Mode: Progress through levels of increasing difficulty, facing Sans’ attacks in sequence.
Practice Mode: Ideal for beginners to learn attack patterns without the full intensity.
Endless Mode: A grueling test of endurance with continuous attacks to see how long players can survive.
Single Attack Mode: Focus on practicing individual attacks.
Custom Attack Mode: Allows players to create or experience specific attack combinations.
The game is notoriously difficult, with some attacks, like the “bonestab1” or blaster spam, described as nearly impossible to dodge without taking damage. The lack of invincibility frames and pixel-perfect hitboxes amplify the challenge, though some argue this mirrors the original Undertale fight’s intensity. Players must balance survival with strategic use of healing items, accessed via buttons like Fight, Act, Item, and Mercy.
Bad Time Simulator is a love letter to Undertale fans, distilling the Sans fight into a standalone, brutally challenging experience. Its blend of bullet-hell gameplay, iconic music, and faithful design captures the essence of one of gaming’s most legendary battles.
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