Murder Mystery 2 (MM2) is one of the longest-running popular games on Roblox — a social deduction game where players are randomly assigned hidden roles and must either kill, survive, or identify the killer. Beyond the core gameplay, MM2 has a deep trading economy built around cosmetic knives and guns. Here's how both sides work.
The Three Roles
| Role | Tool | Win Condition | Player Count |
|---|---|---|---|
| Murderer | Knife | Kill all Innocents and Sheriff before time runs out | 1 per round |
| Sheriff | Gun | Identify and shoot the Murderer | 1 per round |
| Innocent | None (until Sheriff dies) | Survive the round or help identify the Murderer | Everyone else |
Roles are randomly assigned each round. You can't choose your role — play whichever you're assigned. If the Sheriff is killed, any Innocent can pick up the dropped gun and use it to shoot the Murderer.
Playing as Murderer
The Murderer must eliminate all other players while staying undetected:
- Prioritize the Sheriff: The only player who can shoot you is the Sheriff. Eliminating them first means no one else can stop you.
- Use the knife throw: Your knife can be thrown — this is a ranged attack. It one-shots anyone it hits, including the Sheriff from a distance.
- Blend in: Move normally, don't follow the Sheriff obviously. Innocents who see suspicious behavior will call it out in chat.
- Pick your moments: Kill when you're alone with a target or in a spot where others can't see. Witnessed kills end rounds quickly.
Playing as Sheriff
You have one shot — miss and shoot an Innocent, and you die and lose your gun:
- Don't rush: There's no point shooting immediately. Watch for behavioral tells — player following others, holding a knife visibly, or moving away from groups.
- Watch the knife: The Murderer holds the knife when close to killing. The visible knife is your confirmation.
- Shoot at distance: Shooting from further away reduces friendly-fire risk and gives you a better sight line.
- If you're not sure, wait: Time running out with no correct kill is better than accidentally shooting an Innocent (which kills you and drops your gun).
Playing as Innocent
- Stay in groups — it's harder for the Murderer to get to you when others are watching
- If you see the Murderer, type in chat immediately to alert the Sheriff
- Watch for the Sheriff's gun — if they're killed, get to it quickly before the Murderer does
- Coins are earned each round by surviving or killing — surviving as Innocent earns coins for opening boxes
Knife Values and the Trading Economy
MM2's trading scene is built around cosmetic knives and guns. Rarity tiers from lowest to highest value:
| Tier | Description |
|---|---|
| Common | Lowest value, hatched frequently from basic boxes |
| Uncommon | Slightly rarer, low-mid trade value |
| Rare | Less common, solid mid-tier |
| Legendary | High demand, significant value |
| Ancient | Very high value, limited availability |
| Vintage / Classic | Older items with collector value |
| Godly / Unique | Highest tier — often from limited events or Robux purchase |
Limited-event and seasonal items carry additional demand because they're no longer obtainable. Value is community-driven and fluctuates — check current trading communities (r/MurderMystery2, MM2 Discord servers) for up-to-date valuations before making major trades.
How to Get Knives Without Robux
- Earn coins by playing rounds (surviving or killing)
- Spend coins to open free boxes — these drop Common and Uncommon knives
- Trade up from low-tier knives over time
Getting Godly knives for free requires many trades starting from accumulated lower-tier items — it's a long process but doable without Robux.
Frequently Asked Questions
How do you play Murder Mystery 2?
Each round assigns you Murderer (knife, kill everyone), Sheriff (gun, shoot the Murderer), or Innocent (survive). Murderer wins by killing all players; Sheriff wins by correctly shooting the Murderer.
How do you win as the Murderer?
Eliminate the Sheriff first using your knife throw. Then kill Innocents while blending in. Avoid being seen killing.
How do you win as the Sheriff?
Watch for the Murderer to reveal themselves — visible knife or caught in the act. Don't shoot until you're certain. A wrong shot kills you and drops your gun.
What are knife tiers in MM2?
Common, Uncommon, Rare, Legendary, Ancient, Vintage/Classic, Godly/Unique — from lowest to highest value.
Last updated: June 2026 · All Roblox guides