Play Betrayal IO online for free

Betrayal.io: A Party Mystery is a fun guessing game that should be played with friends or lots of players in the game. In this game you are the star in the movie series BETRAYAL Your goal is to act as the role of the Betrayer or as a Crewmate (Friendly). As the Betrayer, you need to eliminate all the friendlies by killing them and not getting caught or voting them off! As a Friendly, you need to complete tasks and vote off the betrayer and survive! It's a very thrilling game that will give you that trust issues... Play now and find out who is the Betrayer..... It could be you!

Betrayal IO is available on GameBig as a browser game. You can launch it when you are ready (use the green Play button below so the game only loads after you choose to play, which keeps the first view of this page lighter for visitors on slower connections).

Our editors describe each title with the official short description when provided, list the default controls, and link related games so you can discover more in the same genre. If you need help with account issues, removals, or partnerships, use the contact page so we can respond by email.

Topics and tags: Multiplayer, Killing, Guessing, Html 5. These labels help you find similar games from our catalog without leaving the site.

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Betrayal IO 82,376 plays
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About this game on GameBig

Summary. Betrayal.io: A Party Mystery is a fun guessing game that should be played with friends or lots of players in the game. In this game you are the star in the movie series BETRAYAL Your goal is to act as the role of the Betrayer or as a Crewmate (Friendly). As the Betrayer, you need to eliminate all the friendlies by killing them and not getting caught or voting them off! As a Friendly, you need to complete tasks and vote off the betrayer and survive! It's a very thrilling game that will give you that trust issues... Play now and find out who is the Betrayer..... It could be you!

Audience. Titles on GameBig are aimed at casual players looking for short sessions in the browser. Difficulty and themes vary by developer; use tags and related games to narrow what you like.

Fair play. Scores and achievements depend on the third-party build we embed. If something looks broken after an update, reload the page once or report the game with the flag button above.

How to play β€” controls for Betrayal IO

Follow the scheme below while the game window is focused. On desktop, click inside the game area first so keyboard input reaches the title.

  • Move
    Interact
  • Fullscreen (page)

Tips for a smoother session

  • Close unused tabs and pause large downloads so the browser has free CPU for Betrayal IO.
  • Use fullscreen when supported for a stable aspect ratio and fewer accidental clicks outside the frame.
  • If audio is blocked, interact once with the page (Play counts) so autoplay policies can unlock sound where the developer allows it.
  • Bookmark this URL if you plan to return; the same page will list updated play counts and community rating over time.

Frequently asked questions

Is Betrayal IO free here?
Yes. We host a free-to-play embed on this page. Optional ads on the site may appear according to our policy and your region.
Do I need to install anything?
No app store install is required for typical HTML5 games. Flash-era titles may use in-browser emulation (Ruffle) when marked as SWF.
Can I play on mobile?
Many games support touch; some are keyboard-first. If controls feel awkward, try rotating the device or switching to a desktop browser.

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