Sin City Slayer casino murder mystery

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A Las Vegas casino murder mystery party game for 8-18 guests, ages 14+. This is an in-person game that is formatted to play face-to-face. For virtually-formatted games, click here. Get ready for a hilarious celebrity-themed murder mystery party game set in glamorous Las Vegas! With both expansion packs, this game is expandable to 38 unique players and up to 53+ with the additional expandable paparazzi player (see the expansion pack #1 for details).This is the instant download version of the game - you'll have everything needed to play instantly upon purchase. No shipping fees, no waiting! For the party ready pack, click on the link below in the helpful links section.

There are four PDF files to download with this game - a host instruction file, printable file, solution key, and an optional free invitation file. 

Five out of ten difficulty. This game was updated on 8/16/21

Helpful Links:

 Host character list

 Free, printable invitation

 Sample game materials

 Murder mystery prop emporium

 12 character, Expansion pack #1 - Purchased separately

 8 character, Expansion pack #2 - Purchased after Expansion pack #1

 Boxed version - My Mystery Party will prepare your party ready kit

 Direct your guests here - the corresponding pre-game site at Your Mystery Party

Murder Mystery Synopsis:

The most highly anticipated VIP party in Las Vegas is almost here! The Cosmo Casino & Resort is set to host a world class soiree for celebrities, news media, and a few Vegas locals that were lucky enough to score tickets. Some of the most prominent figures of our time will be in attendance and this will certainly be a night to remember. However, there is a situation.

The city of Las Vegas has been terrorized by a serial killer with an MO of attending VIP events held on the strip. The killer, known as the Sin City Slayer, chooses victims from unsuspecting party guests. The Las Vegas police are currently working with federal agencies to catch this deranged predator. Hopefully, the killer doesn’t have a ticket to this event. This is where your story begins.

How to Host a Large Party:

  • 18 unique players from the main game.
  • 12 unique players from expansion pack #1 (purchased separately)
  • 8 unique players from expansion pack #2 (purchased separately)
  • Up to 15 paparazzi expandable duplicate players to play with Reagan Paratzy (expansion pack #1, purchased separately)
  • Up to 15 Monster Muggies Cast member expandable duplicate players to play with Logan Mack (expansion pack #2, purchased separately).

The expandable players are not unique story lines, but rather are supporting players for Reagan Paratzy & Logan Mack. They will, however, have duplicate clue cards each round, they mingle each round like everybody else, and they still guess whodunit. The only difference is that they will not have a unique story line. These players are great for shy/reserved players, last minute RSVPs &/or adult guests who may consume a few too many cocktails.  

Follow My Mystery Party's board Sin City Slayer: Vegas Murder Mystery Party Game on Pinterest.

If you wish to host this (or any other) game for profit, you will need a commercial license or provide us with your 501C number for a charity fundraiser - click here.

Minimum age:
14 years
Difficulty rating:
Moderate, 5/10
Gender of character roles:
Flexible (most players)
# of players:
8-18 players
Expansion pack(s):
12 players, 8 players
Expandable team players:
Expands to 68+ players with teams (including expansion packs)
Date of publication:
Last revised 8/16/21


  • 5
    Sun City Slayer

    Posted by Lynnise on Apr 5th 2023

    We hosted the Sin City Slayer mystery party for our adult children, adult grand children and their spouses. It was the first time and we had an amazing time! We decorated the entire basement including real casino game which we played during the mystery, Do the RAP Battle game we all laughed till we hurt. It was great! Well organized, fun characters and story line- loved it. There is a LOT of prep work for a big party (22 for us) but well worth it. They have voted it be a yearly get together. I call that a win!

  • 5
    Great party!

    Posted by Unknown on Nov 25th 2021

    After I mentioned having done a MMP at a restaurant, my daughter was determined to do one at home for her 11th bday with family. She looked at all the options, picked this one, and I bought the download package. There was a lot to go through and it seemed a little overwhelming at first, but after my second read through, it became clear that you actually don’t have to do much except hand out the clue cards and your guests will take care of the rest. We had a younger child and and adult I knew would not be participating no matter what was going on around them, so we assigned them non-required parts—i printed out the character sheet for my daughter to pick roles and just made sure her assignments would work with the story and people so she didn’t know whodunnit. If you are in character, your guests will be immediately in character. I answered the door as the wealthy socialite, and my guests immediately responded as their characters, and it turned out great. It was hysterical. My son was the magician and he learned a card trick to do with people as he walked around. My husband was the poker player/comedian and would randomly pull out his phone and loudly give a really corny joke. It all flowed really well. We played a nerf gun poker game between rounds to space things out. Took about 3 hours to complete with the game and food in between. Multiple people said it was a great change and asked if we could do another one at xmas! A month later now and family members are still treating each other like the game. Will definitely be doing another one.

  • 5
    Great evening and convincing plot

    Posted by Unknown on Nov 7th 2021

    This murder mystery was actually written so that guests could identify the murderer. The characters were all funny and unique.

  • 5
    So much fun!

    Posted by Ashley on Aug 29th 2021

    Our group of 12 women had so much fun playing this! It was even better that everyone dressed up as suggested and played along the whole time. We will definitely be playing again soon!

  • 5
    Totally awesome evening!

    Posted by Ashlie Taylor on Jan 4th 2021

    This is the second murder mystery I’ve done and every person in attendance has completely enjoyed ourselves and we plan on doing it again. Ending/revealed can be a little confusing and could use a little more clarification but we have no complaints and absolutely loved it!

  • 5
    Fun Mystery, Fun Party

    Posted by Lisa M. on Sep 27th 2020

    My guests enjoyed the characters and their stories.

  • 5
    Fantastic and easy to use

    Posted by Natalie on Jun 15th 2020

    We have always wanted to do a murder mystery and just never got around to it. With minimal funds we noticed we could purchase the pack and do it ourselves. The pack was complete with everything we needed to know and easy to use instructions. We were very impressed and had such a fantastic night Thank you

  • 5
    excellent family game

    Posted by Unknown on May 11th 2020

    my family really enjoyed the game! Great time had by everyone

  • 5
    Great New Year's Party

    Posted by Gina on Jan 5th 2020

    Our party was a total success! Everyone had a great time!! Decorated the house as a casino and played BlackJack and Roulette for additional fun. Just want to mention, as the host, it is hard to avoid knowing information while cutting and preparing guests clues from the download version. The main issue is that no matter what level of difficulty is purchased the first 8 characters are required and the remaining characters are optional so you know the optional characters are not the victim or murderer. This is only an issue for the host. As the host, who wanted to participate, I tried very hard to avoid knowing character names and where they were listed on the invite list before the game. Next time I would have some one else that doesn't know this information cut the clues.