How to Play Bad Monday Simulator
You control the soul of Nermal, who has accidentally wandered into the world of Undergarf. Your goal is to survive a grueling boss battle against Sansfield (a terrifying fusion of Sans and Garfield).
During Sansfield's turn, you must navigate your soul inside the bullet board to dodge a relentless barrage of bones, comic panels, and lasagna-themed attacks. When it is your turn, you can choose to FIGHT, use the PRAY command (which replaces the standard ACT menu), use an ITEM, or attempt MERCY.
Game Controls
| Key | Action |
|---|---|
| Arrow keys | Move your soul and navigate menus |
| Z / Enter | Confirm selection |
| X / Shift | Cancel or slow down soul movement |
Make sure you click on the game window first so your keyboard inputs are registered properly.
What is Bad Monday Simulator?
Bad Monday Simulator is a wildly popular fan game set in the "Undergarf" universe—a dark, comedic crossover between Undertale and the Garfield comic strip. Developed by Spasco, featuring art by Lumpy Touch and music by Polarial, the game has gained a massive cult following for its high-quality animation, catchy soundtrack, and punishing difficulty.
The game flawlessly replicates the core mechanics of Undertale's most notorious boss fights while injecting a unique sense of humor. Sansfield's attacks will inflict "karma" (purple poison damage) that slowly drains your HP over time, requiring you to carefully manage your healing items to survive his final judgment.
Game Modes
- Normal: Start with 100 HP and a full inventory of healing items. This is the recommended starting point to learn Sansfield's complex attack patterns.
- Hard: Your max HP is reduced to 50, and your item inventory is severely limited. A true test of your dodging skills.
- Monday: The ultimate challenge. You have only 1 HP and zero items. A single mistake means an instant game over.
Tips for Surviving Monday
- Understand Karma: Healing items cure the purple "karma" poison first before restoring your actual HP. Don't let the poison tick down your health if you can avoid it!
- Use the PRAY Command: The PRAY option replaces ACT and offers random effects. There is a 10% chance to summon the Pasta Fairy, which grants you extra healing items. Use this early in the fight to stockpile resources.
- Watch for Blue Attacks: Just like in the original game, when an attack turns blue, stop moving completely to avoid taking damage.
Frequently Asked Questions
Is Bad Monday Simulator a full game?
No, it is a focused, single-encounter boss battle simulator, similar to other fan-made Undertale battle games. It features multiple phases and difficulty modes, but it does not have an overworld to explore.
Who are the creators behind Bad Monday Simulator?
The game's high-quality pixel art and animations were created by Lumpy Touch. The programming and engine work were done by Spasco, and the custom soundtrack was composed by Polarial.
Are there multiple endings?
Yes. Depending on whether you choose to relentlessly FIGHT Sansfield or try to survive long enough to grant him MERCY, you will experience different dialogue and conclusions to the battle.
What happens if I choose the Monday difficulty?
Monday difficulty is designed for absolute masters of the game. You are given exactly 1 HP and no items whatsoever, meaning you have to complete the entire grueling boss fight without taking a single hit.
Can I play this game on a mobile device?
Bad Monday Simulator relies on precise keyboard inputs for dodging bullet-hell patterns and selecting menu options. It is highly recommended to play on a desktop or laptop computer for the best experience.