Free riddles for grown-ups, teens and kids

Trivia

46 free riddles at 3 levels. Filter by age or level, and reveal each answer when you are ready. No signup.

#229 Ages 18+

In which century did Johannes Gutenberg's printing press revolutionize the spread of the written word in Europe?
#230 Ages 18+

What is the only mammal capable of true, sustained flight?
#231 Ages 18+

Which element has the chemical symbol 'Fe'?
#232 Ages 18+

What is the collective noun for a group of crows?
#233 Ages 18+

Who painted the ceiling of the Sistine Chapel?
#234 Ages 18+

What is the smallest prime number?
#235 Ages 18+

What economic term describes a situation where prices keep rising while economic growth stalls and unemployment stays high?
#236 Ages 18+

Besides echidnas, what is the only other living mammal that lays eggs?
#237 Ages 18+

What is the scientific study of fungi called?
#238 Ages 18+

Einstein's Nobel Prize in Physics was not awarded for relativity. What was it awarded for?
#239 Ages 18+

"Laser" began life as an acronym. What do its five letters stand for?
#240 Ages 18+

Which is the only sea on Earth with no coastline, bounded entirely by ocean currents rather than by land?
#241 Ages 18+

Which nineteenth-century novel opens with the three words "Call me Ishmael"?
#242 Ages 18+

Which blood type is known as the universal donor for red blood cell transfusions?
#173 Ages 12–15

What is the chemical symbol for gold?
#174 Ages 12–15

In which year did World War II end?
#175 Ages 12–15

What is the largest ocean on Earth?
#176 Ages 12–15

Who wrote the play 'Romeo and Juliet'?
#177 Ages 12–15

What organelle is often called the "powerhouse of the cell"?
#178 Ages 12–15

How many sides does a hexagon have?
#179 Ages 12–15

About how fast does light travel, in kilometers per second?
#180 Ages 12–15

What is the capital city of Australia?
#181 Ages 12–15

Which planet in our solar system is tipped so far over — roughly 98 degrees — that it effectively rolls around the Sun on its side?
#182 Ages 12–15

What is the longest river in Africa?
#183 Ages 12–15

Which two gases make up about 99% of the air in Earth's atmosphere?
#184 Ages 12–15

In which year did the Berlin Wall fall?
#185 Ages 12–15

What do the three letters in "DNA" stand for?
#186 Ages 12–15

Which ancient Greek thinker gives his name to the theorem that a² + b² = c² in a right-angled triangle?
#113 Ages 10–12

What is the largest planet in our solar system?
#114 Ages 10–12

How many continents are there on Earth?
#115 Ages 10–12

What is the tallest mountain in the world, measured from sea level?
#116 Ages 10–12

How many legs does a spider have?
#117 Ages 10–12

What gas do plants absorb from the air to help make their own food?
#118 Ages 10–12

What is the freezing point of water, in degrees Celsius?
#119 Ages 10–12

Which planet is known as the "Red Planet"?
#120 Ages 10–12

About how many bones are in the adult human body?
#121 Ages 10–12

What is the smallest planet in our solar system?
#122 Ages 10–12

What is the largest organ in the human body?
#123 Ages 10–12

What is a baby kangaroo called?
#124 Ages 10–12

How many hearts does an octopus have?
#125 Ages 10–12

What is the largest desert in the world?
#126 Ages 10–12

How many chambers does the human heart have?
#127 Ages 10–12

What is the hardest naturally occurring substance on Earth?
#128 Ages 10–12

What is the chemical formula for water?
#129 Ages 10–12

About how many teeth does an adult human have, including wisdom teeth?
#130 Ages 10–12

What is the tallest land animal in the world?

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