✅ Last Updated: June 2026 | Verified this week
MMK, recently rebranded as Murder Rivals, is a round-based Roblox murder mystery game made by the verified Korean group 한국머더. Each round hands everyone a secret role, where you either survive as an Innocent, hunt the killer as the Sheriff or a Hero, or try to take out the whole lobby as the Murderer. There are hundreds of weapons to collect and several modes to play, and figuring out who the Murderer is before they reach you is the heart of every match.
The game launched back in September 2020 and has been played over 191 million times, which makes it one of the longest-running murder games on Roblox. This guide covers the roles, how to play, the weapons, and tips for new players, with links to the codes and script pages at the bottom.
MMK Overview
| MMK Overview |
| Game Name |
MMK (Murder Rivals) |
| Developer |
한국머더 (verified group) |
| Genre |
Murder Mystery |
| Platform |
Roblox (PC, Mobile) |
| Visits |
191M+ |
| Max Players |
12 |
| Release |
September 2020 |
How to Play MMK
- Load into a round and check the role you have been given, since your goal changes completely depending on it.
- As an Innocent, run and hide from the Murderer and try to survive until the round ends.
- As the Sheriff, or a Hero who has picked up a gun, find and shoot the Murderer to protect the lobby.
- As the Murderer, take out the other players without getting shot by the Sheriff first.
- Collect and unlock new weapons as you play, and try the different modes for variety.
MMK Gameplay and Strategy
MMK is built around short, tense rounds rather than open-world grinding. Every round drops up to 12 players into a map and secretly assigns the roles, so nobody knows for sure who the Murderer is at the start. Reading how other players move and react is the real skill, since the Murderer is hiding in plain sight until they strike.
Collecting weapons is the main thing to chase outside of each round. There are hundreds of weapons to unlock and several modes to play through, so the more you play, the more variety you build up across all four roles. Getting better is less about a power level and more about learning the maps, the modes, and how each role wins.
The game has staying power. It has been live since 2020, the verified Korean developer still updates it regularly, and it recently picked up the new name Murder Rivals as it adds English support. It also runs active anti-cheat, and the developer warns that using cheats can get your accounts banned, so the fair way to climb is to get good at reading the lobby.
Tips for New MMK Players
- As an Innocent, keep moving and avoid dead-end corners where the Murderer can trap you.
- Watch how other players behave, since the Murderer often gives themselves away by following people or acting oddly.
- As the Sheriff, do not waste your shot, and only fire when you are sure you have the right player.
- Learn the maps and modes so you know the safe spots and the quickest escape routes.
- Keep playing rounds to unlock more weapons, since having variety helps you in every role.
MMK FAQ
What kind of game is MMK?
MMK, also known now as Murder Rivals, is a round-based Roblox murder mystery game by a verified Korean developer. Each round you get a role, Innocent, Hero, Sheriff, or Murderer, and your goal is to survive, protect the lobby, or take everyone out. It launched in September 2020.
Is MMK free to play?
Yes, MMK is free to play on Roblox. You can jump into rounds and play any role without spending anything, and you unlock more weapons just by playing.
Does MMK have codes?
No. MMK has no code box and no working codes right now, and the developer rewards players through rounds and weapon unlocks instead. Check the MMK Codes page for the live status in case that ever changes.
What are the roles in MMK?
There are four roles. The Innocent tries to survive, the Sheriff protects the innocents and shoots the Murderer, the Hero can pick up a gun to help, and the Murderer tries to take out everyone in the lobby without getting shot.
Does MMK have PVP?
Yes. MMK is player versus player within each round, since the Murderer is hunting the other players while the Sheriff and Heroes try to stop them. The whole game is built around that cat-and-mouse fight.
MORE FOR MMK
Looking for codes? Check the MMK Codes page for the live code status for this game.
Looking for scripts? See the MMK Script page for the working script for this game.