Murder mystery for 20 players

Twenty players is about the largest murder mystery most homes, offices or party rooms will host, and when it works it's a spectacle. Twenty suspects means half a dozen conversations at once, clue trades across the room and a final vote that genuinely splits the crowd. It also means you can't run it like a dinner party. Treat it like a gala with a plot.

Big Party: up to 20 guests for $39, one time.

Try it free From $24 for the whole party

A twenty-player game needs 150 minutes and a firm schedule. Allow 25 minutes for arrival, the opening scene and quick introductions, then three clue rounds of 25 to 30 minutes. Accusations take 20, because twenty people need time to make their case and vote, and the reveal and awards get 25 to close the night with a bang. On New Year's Eve, start the opening scene at 9:30 and the awards wrap up right as the countdown begins.

The case scales by clusters. In the masquerade example below, five side plots of four characters each (a missing diamond mask, a champagne shipment that arrived short, a rigged charity auction, an estranged sibling's return and a midnight show hiding a secret) all intersect with the murder. Each cluster plays like a small game of its own in round one, then the threads cross. Twenty guests fit the Big Party plan, $39 one-time for up to 20, and each guest gets a private invite page with costume ideas, so the whole crowd shows up dressed for the same party.

20 players,
how it works

Five side plots of four characters each is a dependable shape. Every character has a motive for the murder, and the six or seven strongest motives are spread across different clusters so no single group owns the solution.
Plan on eight to ten red herrings at twenty, roughly two per cluster, each one cleared when its side plot resolves.
Every cluster should hold at least one link in the chain of clues that proves the killer, so the room has to share across groups before accusations.
Phones are the practical choice at twenty: each guest gets private objectives and clues on their own screen, and twenty people can study a letter or replay a voicemail in the Evidence Locker without crowding one printout. Print name tags and place cards from the optional kit even if you play on phones.

A cast of
20

Every Killer Cast mystery is written for your own guest list. Here is what 20 suspects can look like in the New Year's Eve Masquerade Gala theme.

Jordan Laurent
Jeweler who lent the famous diamond mask for the night (mask plot)
Lennox Sharpe
Rival collector who bid on the mask and lost (mask plot)
Val Kessler
Insurance investigator who insured the mask just last week (mask plot)
Casey Whitmore
Security chief who swears the vault was locked at ten (mask plot)
Riley Dumont
Champagne importer whose crates arrived one short (champagne plot)
Jamie Thistlewood
Caterer who knows which guest ordered the special dessert (champagne plot)
Perry Gladwell
Valet who parked every car and noticed one leave early (champagne plot)
Winter Hargrove
Head of staff carrying the master key ring (champagne plot)
Cameron Stroud
Charity auctioneer with a gavel and a grudge (auction plot)
Rory Westfall
Campaign manager working the room for donations (auction plot)
Marion Bexley
Etiquette columnist keeping a list of every faux pas (auction plot)
Harper Valcourt
Business partner of the gala's patron, who planned every minute of the night (auction plot)
Sutton Wexley
Estranged sibling of the gala's patron, back after ten years away (family plot)
Skyler Ashgrove
Architect who redesigned the ballroom, hidden doors included (family plot)
Emerson Glass
Masked stranger who RSVP'd under a borrowed name (family plot)
Phoenix Rayne
Fortune-teller in the parlor whose predictions keep coming true (family plot)
Gray Montclair
Bandleader counting the ballroom down to midnight (midnight-show plot)
Stevie Lark
Singer booked for the midnight countdown (midnight-show plot)
Nico Arceneaux
Stage magician hired for a vanishing act at midnight (midnight-show plot)
Drew Halloran
Society photographer capturing every unmasking (midnight-show plot)

How the night
runs

150 minutes from arrival to the reveal.

Arrival: opening scene, quick introductions and the body is discovered25 min
Round 1: alibis and the five side plots kick off25 min
Round 2: secrets surface and the clusters trade clues30 min
Round 3: final evidence and the lock-box puzzle25 min
Accusations: a spokesperson case from each cluster, then everyone votes20 min
Reveal: the killer and the clue chain15 min
Awards and party recap10 min

Tips for 20 players

Put the host screen on the biggest TV you have and turn the narrator up for each round's opening. With twenty people, the round timer only helps if everyone can see it.
Masks hide faces, so pin character name tags somewhere visible, like a lapel or a lanyard. It saves a great many rounds of "wait, who are you?"
Recruit two helpers, one for the door and one for drinks. At twenty, late arrivals and empty glasses will otherwise pull you out of the game.
Mark absences before round one. With twenty guests a no-show or two is likely; once they're marked absent, their must-share clues move to someone present and the case stays solvable.
Set up a neutral gossip corner near the bar, where the mask plotters can bump into the auction crowd. Big groups need a spot where clusters mix.
Serve food that works standing up, like sliders, skewers and a dessert table. A seated dinner for twenty swallows a whole round.

Questions

Can a murder mystery really work with 20 players?

Yes, with a 150-minute game and a case built around clusters. Five side plots of about four people each give everyone an urgent reason to talk to someone in round one, and the clusters merge as the evidence piles up.

Which plan do I need for 20 players?

Big Party: $39, one-time, for up to 20 guests. There's no subscription and no per-player fee.

What if someone cancels?

Re-casting is free until 24 hours before the party, and only the affected character and clue assignments change. On the night, mark any no-show absent and their must-share clues move to a player who is there.

What if extra people show up?

Every case includes 2 standby characters written for surprise guests, so a couple of unexpected plus-ones can join the story during arrival.

Does a 20-player game work for a family reunion or an office party?

Yes. The case stays PG-13, portraits from selfies are optional and only for adults who consent, and family mode skips selfies entirely, giving every character a drawn look instead.