The free endless dive trivia game where the rarest answer wins
Mahjong looks good on you.
Stage
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Founded
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Based in
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Pricing model
Free
Freemium
Pricing
Not given
Free browser play without account or download. Web Membership available in the United States with a 30-day free trial for eligible new subscribers. App purchases available through the App Store where available.
Key features
Seven prompts per dive with 25 seconds each
Six rarity scoring tiers from Plankton to One in a Krillion
Ocean depth visualization showing score as metres descended
Five real ocean zones from Sunlit Shallows to Hadal Trench
Unlimited mode for endless practice dives
Daily dive with same prompts for everyone
Multiplayer with pass-and-play or online rooms
Practice mode with no time pressure
Question bank with 172 hand-built questions
No account required; play as guest
Free browser-based play without account or download required
Learn through guided practice hands with bots
Plan and host game nights with shareable invitations
Multiple expressive tile set designs
Run mahjong clubs with weekly tables and point tallies
Support for National Mah Jongg League card
Hand checking and validation tools
Charleston guide with optional timer for tile passing
Scorekeeping for real table play
What makes it different
Rewards rare answers rather than just knowledge or speed
Never reveals answer lists to preserve mystery
Completely free with no premium tier or paywall
Score visualized as real ocean descent through five zones
Open-ended prompts with broad answer spaces
Respectful approach to the game's Chinese origins and American traditions
No ads and no download required to start playing
Guests can join game nights by name without account creation
Free Krillion
JONGG