Codes
No verified UMS 1.5 promo codes as of September 2026. Check Discord and any in-game redeem box after live updates.
View all Codes Live 1.5 · Fan Wiki
Undertale Multiverse Simulator Wiki
Soul grinding, AU characters, and Pesti Sans guides for Roblox 1.5.
Fan wiki for Undertale Multiverse Simulator on Roblox: soul grinding, AU unlocks, codes, and Pesti Sans guides.
- 2.1M+
- Roblox visits
- 15
- Players per server
- 1.5
- Live remaster
- 0
- Public codes listed
Gameplay
Undertale Multiverse Simulator 1.5 gameplay
Game overview
What 1.5 actually is
Undertale Multiverse Simulator 1.5 is a free Roblox battleground where you grind souls to unlock AU Sans and Papyrus kits. The original place was hacked; this continuation launched on 22 May 2026 and does not restore old souls. Start with the getting started guide, then check working codes, the character tier list, and the Pesti Sans fight.
Quick facts
- Developer
- SlayerRealNotFake
- Platform
- Roblox (PC, mobile, gamepad)
- Genre
- Action / Battlegrounds
- Release
- 22 May 2026 (1.5)
- Price
- Free to play
- Server size
- 15 players
Explore the wiki
Hubs for codes, characters, soul routes, scripts, and the 1.5 remaster.
Guides
Hub of 1.5 walkthroughs: first join, soul grinding, PC/mobile controls, phases, evolutions, and beating Pesti Sans.
View all GuidesTier List
Opinionated UMS 1.5 S through C ranks by PvP pressure, farm speed, and soul-cost efficiency, not a gacha list.
View all Tier ListCharacters
UMS 1.5 character hub: Pacifist Sans, Scarlet Tenacity, starter kits, stronger rooms, event bosses, and evolutions.
View all CharactersUpdates
Patch timeline for Undertale Multiverse Simulator 1.5: May remaster, July Pesti, August kits, and September badges.
View all UpdatesScripts
Public scripts for UMS 1.5 are scarce. Read old-game claims, executor risk, and why Roblox bans still happen now.
View all ScriptsTools
Practical UMS 1.5 tools: soul-unlock brackets, a controls cheatsheet, plus links into grinding and starter kits.
View all ToolsLinks
Official Roblox page, Discord invites, unofficial Fandom wikis, and this fan wiki for Undertale Multiverse Simulator 1.5.
View all Links Featured guides
Beginner routes, soul grinding, phases, and the Pesti Sans fight.
Latest updates
1.5 remaster notes, events, and character additions.
Popular right now
The pages players open after a fresh server join.
Quick start
New to 1.5? Follow this order so you do not waste early souls.
- 1
Join the 1.5 place, not the old one
Open Undertale Multiverse Simulator 1.5 on Roblox. The original place was hacked; souls from that file do not transfer. Confirm the creator is SlayerRealNotFake before you grind.
- 2
Learn controls, then pick a starter
Read the controls sheet (R lowers HP, Z opens the emote wheel). Unlock cheap kits from the starter roster and follow getting started.
- 3
Grind souls into the stronger rooms
Use the soul grinding route until you can enter the stronger character zone. Check costs in the soul unlock tool before you buy a dead kit.
- 4
Phase, evolve, then hunt event kits
Phases are extra soul prices, not a hidden key — see how to phase and how to evolve. Event kits such as Pesti Sans sit in the event roster.
- 5
Stay current on codes, scripts, and patches
Recheck codes and Discord links after updates. Treat scripts as high-risk. Patch history lives on the updates hub.
Browse everything
Jump to any codes, character, guide, or tool page.
FAQ
Wiki FAQ
Quick answers to the most common questions.
Is Undertale Multiverse Simulator a Roblox game?
Yes. The live file is Undertale Multiverse Simulator 1.5, a free Action / Battlegrounds experience. This wiki is unofficial.
Do souls from the original game transfer?
No. The original place was compromised. 1.5 is a continuation with a fresh soul count. Details are on the original game page.
Where should a new player start?
Follow getting started, claim anything on codes, then pick from the starter characters list.
Which languages are supported on this wiki?
English, French, German, Spanish, and Brazilian Portuguese. Legal pages stay in English.
Are there working promo codes?
As of September 2026 we have not verified a public code list. See how to redeem and watch the Discord for drops.
How do I beat Pesti Sans?
Keep range, dodge the small blasters, and heal on cooldown. Full notes are in the Pesti Sans guide.
Why can't I join, and is the game 16+?
Community reports put 1.5 at 16+, and some new accounts needed days played. Use the how to join checklist and confirm the live place on version 1.5.
What badges exist in 1.5 right now?
Roblox currently lists Pesti Sans Defeated, an ellipsis badge, youve pushed too far, and but he gave up. Details are on the badges page.
Ready to start grinding souls?
Read the getting started guide, pick a starter character, then follow the soul grinding route into the stronger zone.
Open the beginner guide