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GuessKinFish

Guess the mystery fish! Each guess reveals how closely related it is through the ichthyological classification tree.

Play Today's Challenge

How It Works

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Guess a Fish

Type any fish name. From great white sharks to tiny guppies, explore the underwater world.

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See the Tree

Each guess reveals the taxonomy tree — showing how fish relate through shared orders and families.

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Find the Target

Sharks and rays are more closely related to each other than to any bony fish! Can you find it in under 5 guesses?

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One Fish Per Day

Every day at midnight UTC, a new mystery fish is chosen — the same one for everyone around the world. You get 20 guesses to find it. Share your results with friends and compare scores!

Same fish globallyResets at 00:00 UTCTrack your streaks

Game Modes

Multiple ways to test your knowledge

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Daily

One fish per day. Same for everyone.

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Practice

Random fish. Unlimited plays.

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Sharks & Rays

Cartilaginous fish — sharks, rays, skates.

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Tropical

Popular aquarium and reef fish.

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Freshwater

Rivers, lakes, and streams.

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Hard Mode

Tree is hidden. Only text clues.

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Stats

Track progress

Real FishBase / Nelson's Fishes of the World Data

GuessKin Fish uses real FishBase / Nelson's Fishes of the World data. Every node in the tree is based on real classification data.

0 fishFishBase / Nelson's Fishes of the WorldWikipedia images

Share Your Score

Get a Wordle-style emoji grid to share with friends

🐟 GuessKin Fish 2026-03-05 4/20

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guesskin.com

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Free · No account needed · Works on mobile