Unstable SMP Simulator
All of the Minecraft Simulators (Unstable, Bliss, Manhunt etc) you'll ever need with new Sims automatically updated without needing to change the modpack
Screenshots
About this Modpack
If u want any Sims added or find a bug about the modpack pls submit it here
I don't add paid maps!!
Modpack Latest Update (YYYY-MM-DD)
Vexbot: 2026-10-02
Carpet: 2026-09-30
Image from Wemmbu
📦 About
I made this modpack for players to install minecraft Unstable Simulator more easily — without the tedious process of installing maps, selecting mods, and configuring everything manually.
All the necessary mods for PvP are pre-installed with Auto Updating Simulators.
Check out my Mod Version of Unstable Simulators"Under Review"
🔀 Version Differences
| Version | Simulator Type |
|---|---|
1.21.11-x |
Carpet-based simulators |
Vex-1.21.11-x |
Vexbot-based simulators |
Vexbot Simulators (Vex-1.21.11-x)
From Vex-1.21.11-7.x maps will not be included in the Modpack.
Instead there will be a button Import Simulators at the world select screen.
It might take a while due to the maps total sizes (few Gigabytes), so if U don't have time or whatever you can just use Vex-1.21.11-6.2 instead
Note: Vex-1.21.11-6.x will not be updated due to Modrinth Max File Limit (~500MB)
So please Press Import Simulators at the world select screen
Also you DON'T need to update the modpack to get the new simulators just repress the Import Simulators and Import Kits button since Vex-1.21.11-7.3
Maps (Vex-1.21.11-7.x ~ )
- Bat vs Itzrealeme
- Combat Master Training Simulator
- Definitive FlameFrags vs Wemmbu Simulator
- Invis Island Eggchan Bid Fight
- Invis assassin simulator
- Jadenman Vs Wemmbu Simulator
- JamatoP VS SpokeIsHere Simulator
- Lakerek VS Wemmbu Simulator
- Law End Island Defense Simulator
- Law HQ fight
- Law Prison Breakout-v1.4
- ManePear's training simulator
- Miniute Vs Null
- Mist Simulator
- Null Fight Simulator
- Ocean rangers simulator
- Purgatory Finale Fight Simulator-v1.2
- Purgatory Vs Spokeishere Iron
- Shoebilly vs wemmbu simulator
- Spoke VS Leow0ok
- The Council Simulator v1
- The Director simulator
- Theo vs Shoebilly simulator
- UNSTABLE SMP KITS
- Underworld simulator
- Underworld simulator Remastered
- Unstable Battle on HighWater free version 1.0v
- Unstable SMP Tournament
- WemmbuVSFlame
- kingdom_of_the_caves
- smuggler path law fight
- warden vs wemmbu
- zam invasion simulator
- Wemmbu vs Arachn1d simulator
- Unstable SMP Tournament (All In One Simulator)
- Hunger Games
- Wemmbu vs Boosfer Crew Simulator v1
- Theo vs oroboros V1.0
- Mugm vs The Horizon Simulator (Pls read README.txt in the map folder)
- Farex PULL!!!
- Highwater sim Rework
- Wemmbu vs Chungies
- Flame vs Clown
- FlameFrags vs Toxic players Simulator
- Wemmbu vs Null Wraiths
- Wemmbu vs underground civ
- INVIS BLUE GUY SIMULATOR
- UnstableSMP VS WispSMP
- Slushly VS Stormz
- Slushly VS Nufuli
- Wemmbu Vs Flowtives
- Optimized farlands fight
- Jaden_MAN vs Wemmbu
bold = goated
if ur bots arent spawning do /vexbot settings advancedspawn true
fixed bot not attacking Vex-1.21.11-6.2
All Credits to MeteorIsaac, Novit PvP Maps, solyn, CarpetSimulators, Szefciox and Others
Carpet Maps (1.21.x & 1.21.11-x)
Credits to CarpetPVPMaps and CarpetSimulators
| Map | Link |
|---|---|
| Unstable SMP Final Law Battle Simulator | Download |
| 2v1000 Law Battle Simulator Unstable SMP | Download |
| Unstable SMP Great Sea Law Battle Simulator | Download |
| Unstable SMP Tournament Simulator (FREE) | Download |
| Cindercrest Battle Simulator | — |
| Eggchan vs Wemmbu Simulator | only for 1.21.11 Download |
| Parrot vs Saps Simulator | only for 1.21.11 Download |
| Null prison full | only for 1.21.11 |
| Dream Manhunt Simulator Map | only for 1.21 Download |
❌ Not included due to max file size:
Unstable SMP Experience
Many of these maps features like mace bot will not work at 1.21.11
🛒 You can buy more maps from CarpetPVPMaps Patreon
⚠️ You need minimum 18 render distance and simulation distance for these maps to work
🧩 Mods
| Mod | Category |
|---|---|
| Fabric API | Core |
| Carpet | Core |
| Modify Player Data | Core |
| Carpet crit fix | PvP Fix |
| Carpet mace fix | PvP Fix |
| Wither Death Sounds | QoL |
| ukulib | Library |
| uku's Armor HUD | QoL |
| BetterHurtCam | QoL |
| Sodium | Performance |
| Lithium | Performance |
| Alternate Current | Performance |
| AppleSkin | QoL |
| and more.. | — |
👥 Multiplayer
You can use Essential to play with others!
⚠️ Your friends need to have the same modpack installed too.
Available Versions
How to Set Up a Unstable SMP Simulator Server
Order Server
Choose at least 6 GB RAM (8 GB recommended for Unstable SMP Simulator). Based on player count: per 5 players.
Install Modpack in Dashboard
Open the modpack browser in the dashboard, search for "Unstable SMP Simulator" and click "Install". The fabric loader and Minecraft 1.21.11 are configured automatically.
Start Server & Play
Start the server – all mods are loaded automatically. Share the server IP with friends and play together!
Frequently Asked Questions
Unstable SMP Simulator server crashes or won't start – what to do?
Most common causes: insufficient RAM or wrong fabric loader. Check latest.log for "OutOfMemoryError" → increase RAM to at least 8 GB. For "Mixin" or "ClassNotFoundException" errors: modpack version and loader don't match. With Mado Hosting, loader and Minecraft version are auto-configured on modpack install – preventing most startup issues.
How much RAM does a Unstable SMP Simulator server really need?
Minimum 6 GB, recommended 8 GB for stable performance. per 5 players. Important: Minecraft modpacks need more RAM than vanilla – plan extra per additional player. With Mado Hosting, you can scale RAM up live at any time without data loss (from €7.800000000000001/month).
Can I add custom mods to Unstable SMP Simulator without conflicts?
Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.21.11). Common issues: ID conflicts with recipe mods and incompatible coremod versions. The Mado dashboard mod browser only shows compatible mods and warns about known conflicts.
Unstable SMP Simulator server lagging – performance tips
1) Increase RAM to 8 GB+. 2) Reduce server view-distance to 8 (server.properties). 3) Pre-generate chunks with the "Chunky" plugin. 4) Use /spark profiler to check which mods consume the most tick time. With Mado Hosting, all servers run on NVMe SSDs with dedicated CPU cores – eliminating hardware as a bottleneck.
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Rent Unstable SMP Simulator Server
Start your own server with automatic modpack installation.
Supported Versions
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From €7.80/month; 8 GB RAM is recommended for best performance.
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