FATHOMFALL

A battle royale with a mystery at its centre.

A sealed, sinking undersea arena hides a crime: a Culprit, a Method, a Lair. Name all three at the Tribunal, or be the last Sleuth standing. Two ways to win, and if the match runs long, the Crush starts to close the arena.

Play now, free, in your browser How it works

No download · no account needed · plays at work & school (over HTTPS/443)

Why it plays differently

• Most battle royales are decided by aim. Here the first correct accusation wins, so a player who reads the evidence can beat a better shot.
• Most social-deduction games are decided by persuasion. Here the Case has one right answer that the clues prove, so nobody can argue you out of it.
• Most mystery games end once you know the answers. Here every match deals a new Case from the seasonal deck.

How a match works

1. Dive in

   Up to 16 Sleuths drop into a sealed undersea arena. Bots fill any empty seats, so a solo dive is a full match.

2. Find the evidence

   Swim to clues and scan them, and question witnesses. Each confirmed clue rules out part of the Case.

3. Narrow it down

   Your Casebook starts at 216 possible answers: a Culprit, a Method and a Lair. Cross off what the evidence rules out.

4. Unmask, or outlast

   When the Tribunal surfaces, reach the podium and name all three. The first correct accusation wins. If nobody gets there first, the last Sleuth standing wins, and a long match ends inside the closing Crush.

What you can count on

• Cosmetics only. Pearls you earn by playing buy looks, never power. Power comes from in-match gadgets and Kinship Knacks. There is nothing to buy with money.
• The answer stays on the server. No client receives the solution until its own Unmask resolves.
• No install. It runs in the browser, installs to a home screen if you want, and works behind work and school firewalls.
• Squads and a ladder. Squad up to share one Casebook, and climb a ranked Sleuth Rating ladder with no login-streak punishment.

Questions, answered

Can every mystery be solved?

Yes. Every case can be solved from its clues and none can be solved trivially. That is structurally guaranteed and verified against 100,000 cases.

Is it pay-to-win?

No. Nothing is sold for money, and the Pearls you earn by playing buy cosmetics only. Power is normalized across gadgets and Knacks.

Can cheaters see the answer?

No. The game is server-authoritative and the solution is never transmitted to any client until that client's own Unmask resolves.

Do I have to download anything?

No. It runs in your browser, installs as a lightweight app if you want, and works behind work/school firewalls.

Is it scary or gory?

Spooky, not gory: cartoon-macabre and bloodless. You spook rivals; nobody gets hurt.