Somebody brought a knife. Bar of Betrayal is an online social deduction game for 4 to 10 players. Most of you are Regulars, out for a good night. One or more of you are Killers, and nobody knows who.

Nobody works in this bar. Your list for the night is roulette, darts, pool, the slot machines, the piano, the photo booth and 16 more bar games. Every game you finish fills The Tab. Fill it and the Regulars win.

You only see the room you are in. So does everyone else. Wait for an empty room, use the knife, then make the evidence disappear. Hide the body, mop up the blood and pay the staff to forget what they saw.

Find a body, or just the blood, and the Guard blows his whistle. Short on clues? The bartender and the dealers sell what they saw, for gold you won at the tables.

Then everyone sits down in the Interrogation Room. Argue, vote, and watch the Guard throw somebody out of the back door. Only then do you learn if you got the right one.

Not even the drinks. Killers have four sabotages: spike a round on the house, cut the lights, jam the doors, or call a raid that they win unless somebody hides the booze.

Three bars

The Blind Tiger, a speakeasy behind a barbershop. The Midnight Limited, a night train on three decks. The Hotel Lexmore, four floors and a lift. Each has its own games, staff and sabotage.

Bring your friends

• 4 to 10 players online, with Steam invites and lobby codes

• Voice chat built in: at the interrogation table, or all night with proximity chat

• Friends-only lobbies unless the host opens them

• House rules for the host, and extra roles like the Stool Pigeon, who wins by getting arrested

• Ten outfits. Witnesses remember the coat, not the face

• One toilet you should knock on first