The 30 Hardest Trivia Questions (With Answers)
Updated July 22, 2026
These are thirty of the hardest trivia questions with answers, spanning science, history, geography and the arts. They’re designed to catch out even seasoned quizzers — read them, test a friend, then take the playable general-knowledge quiz at the end to see how you measure up.
Hard science questions
1What is the most abundant gas in Earth’s atmosphere?Reveal
AnswerNitrogen (about 78%)2Which planet is the hottest in the solar system?Reveal
AnswerVenus3How many hearts does an octopus have?Reveal
AnswerThree4What is the hardest naturally occurring substance?Reveal
AnswerDiamond5What is the powerhouse of the cell?Reveal
AnswerThe mitochondria6Roughly how long does sunlight take to reach Earth?Reveal
AnswerAbout 8 minutes7What element has the atomic number 1?Reveal
AnswerHydrogen8What is the study of fungi called?Reveal
AnswerMycology
Hard history & geography questions
1What is the capital of Australia?Reveal
AnswerCanberra2Which African country was never colonised?Reveal
AnswerEthiopia3What is the smallest country in the world?Reveal
AnswerVatican City4In what year did World War I begin?Reveal
Answer19145Which country has the most time zones?Reveal
AnswerFrance (via its overseas territories)6What was the ancient city of Istanbul previously called?Reveal
AnswerConstantinople (and Byzantium before that)7Which sea has no coastline?Reveal
AnswerThe Sargasso Sea8Who was the first woman to win a Nobel Prize?Reveal
AnswerMarie Curie
Hard arts & culture questions
1Who painted “The Starry Night”?Reveal
AnswerVincent van Gogh2What is the only even prime number?Reveal
AnswerTwo3Which novel opens with “Call me Ishmael”?Reveal
AnswerMoby-Dick4Who composed “The Four Seasons”?Reveal
AnswerAntonio Vivaldi5What is the longest-running Broadway show?Reveal
AnswerThe Phantom of the Opera (for its record run)6Which language has the most native speakers?Reveal
AnswerMandarin Chinese7What is the national flower of Japan?Reveal
AnswerThe cherry blossom (sakura)8How many keys does a standard piano have?Reveal
Answer88
The real stumpers
1What is the tallest animal on Earth?Reveal
AnswerThe giraffe2How many bones are in the adult human body?Reveal
Answer2063What is the largest planet in the solar system?Reveal
AnswerJupiter4What is the chemical symbol for gold?Reveal
AnswerAu5Which ocean is the largest?Reveal
AnswerThe Pacific6What is the fear of long words humorously called?Reveal
AnswerHippopotomonstrosesquippedaliophobia
Think you actually know your stuff? There’s a live General Knowledge quiz further down — 7 questions, ten seconds each.
Jump to the quiz ↓Frequently asked questions
What is the hardest trivia question?
There’s no single hardest, but classic stumpers include “which planet is hottest?” (Venus, not Mercury) and “what’s the most abundant gas in the atmosphere?” (nitrogen, not oxygen). This post collects thirty of the trickiest.
How do you get better at hard trivia?
Focus on recurring categories — capitals, elements, records and famous firsts — and keep taking quizzes. The questions you get wrong are the ones you remember.
Think you can do better?
7 live General Knowledge questions · 10s each · see where you rank.
So… how well do you actually know General Knowledge?
You just read the guide. Time to prove it — and find out where you’d land on the Quelo leaderboard.