🦠

GuessKinMicrobiology

Guess the mystery microbe! Each guess reveals how organisms relate through their taxonomic classification tree.

Play Today's Challenge

How It Works

🔍

Guess a Microbe

Type any microbe name. Choose from 140 species spanning bacteria, viruses, archaea, protists, and prions.

🌳

See the Tree

Each guess reveals the classification tree — showing how microbes relate through shared evolutionary history.

🎯

Find the Target

Use taxonomy clues to narrow down. E. coli and Salmonella are both Enterobacteriaceae — can you find it in under 5 guesses?

📅

One Microbe Per Day

Every day at midnight UTC, a new mystery microbe 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 microbe globallyResets at 00:00 UTCTrack your streaks

Game Modes

Multiple ways to test your knowledge

📅

Daily

One microbe per day. Same for everyone.

🎯

Practice

Random microbe. Unlimited plays.

🧫

Bacteria

Bacteria only — from gut flora to pathogens.

🦠

Viruses

Viruses only — from common cold to Ebola.

💀

Hard Mode

Tree is hidden. Only text clues.

🏆

Stats

Track progress

Real NCBI Taxonomy / ICTV Data

GuessKin Microbiology uses real NCBI Taxonomy / ICTV data. Every node in the tree is based on real classification data.

0 microbesNCBI Taxonomy / ICTVWikipedia images

Share Your Score

Get a Wordle-style emoji grid to share with friends

🦠 GuessKin Microbiology 2026-03-05 4/20

⬛🟦🟨🟥

guesskin.com

Start Playing

Free · No account needed · Works on mobile