Logic Riddles With Answers

What gets bigger after dinner but smaller the next day?

What word starts with water but does not get wet?

A station clock, a chess clock and a stopwatch all measure me, yet none can keep me once I have gone. What am I?

At midnight I may be tomorrow; by breakfast I have a new name. You can schedule me, but you can never arrive while I am still ahead. What am I?

The same photograph can make a crowd look huge or tiny, depending on which edges are cut away. What silent trick changed the truth?

I arrive as a locked question with all the keys hidden in the clues. Solving me means arranging what is already there. What am I?

Feed me dry wood and air and I grow; starve me of oxygen or give me water and I die. What am I?

In wallpaper I am seen, in a drumbeat I am heard, and in a password I am hunted. Once noticed, I am hard to unsee. What am I?

Lawyers build me, logicians test me, and one weak premise can make me collapse. What am I?

I sit under a conclusion so quietly that people may argue above me for hours. Challenge me, and the whole discussion can change. What am I?

A fence may mark me, a deadline may become me, and a joke may reveal me only after it has gone too far. What am I?

A referee gives me, a court records me, and a crowd may pass me before the evidence is complete. What am I?

It leaves no bruise, yet one remembered action can make it grow heavier for years. What is it?

Two identical glasses hide me. Fill one a centimetre higher than the other, and I appear. What am I?

The moment I am told, I still exist, but I no longer belong to one person. Add more keepers and I become harder to keep. What am I?

I tell time by copying the sun's refusal to stand still; indoors I am useless, and at noon I almost disappear. What am I?

Evidence can open me, fear can close me, and one conversation can change me without touching me. What am I?

I am not written on a CV; comfort may hide me, pressure reveals me, and repeated choices build me slowly. What am I?

A detective may reach me without taking a step, and one false clue can send me in the wrong direction. What am I?

A coin is a circle on the table, an oval from the side, and almost a line at eye level. What changed?

Project managers like me broken into tasks; ignored, I grow costlier; examined, I reveal the next step. What am I?

A lawyer builds me with facts, doubt weakens me, and proof can make me strong again. What am I?

I begin with two premises and end with a conclusion; if my middle term fails, so do I. What am I?

Scientists trust me only after trying to prove me wrong; assume me without testing and I am just a guess. What am I?

Eight is correct after five plus three, wrong after five times three, and meaningless on a blank page. What am I?

I find cracks before publication, improve an argument by pressing its weak points, and work best when the attack is fair. What am I?

Write me in a diary and I am ahead of you; wake up inside me and everyone calls me today. What am I?

Ten seconds before midnight I make a room loud; ten seconds before an exam I make it silent. Same numbers, different feeling. What am I?

I arrive slowly through kept promises, leave quickly after one public lie, and often enter the room before you do. What am I?

Court records, photographs and scars can show me. Apologies may change my meaning, but not my events. What am I?

Ava finished before Ben. Ben finished before Cara. Cara finished before Dan. Who finished last?

The red tower is taller than the blue tower. The green tower is taller than the red tower. Which tower is tallest?

The maths book is above the history book. The science book is above the maths book. Which book is at the top?

The dog is heavier than the cat. The rabbit is lighter than the cat. Which pet is heaviest?

Mia is ahead of Leo. Leo is ahead of Sam. Sam is ahead of Nia. Who is at the back?

The red box is below the yellow box. The yellow box is below the blue box. Which box is highest?

Noah is older than Ella. Ella is older than Max. Who is youngest?

The small cup holds less than the medium cup. The large cup holds more than the medium cup. Which cup holds the most?

Team A scored more than Team B. Team C scored less than Team B. Who scored the most?

Path 1 is longer than Path 2. Path 3 is shorter than Path 2. Which path is shortest?

A cube is painted on all sides and cut into 27 equal smaller cubes. How many small cubes have paint on exactly one face?

What is the maximum number of pieces from 3 straight cuts across a round cake, if each cut crosses all previous cuts inside the cake?

How many sides do 5 separate triangles have altogether?

How many corners do 6 separate squares have altogether?

How many faces do 4 cubes have altogether if they are separate?

A drawer has black socks and white socks. How many socks must you take in the dark to guarantee a matching pair?

Two fathers and two sons go fishing. Each catches one fish, but only three fish are caught. How is that possible?

You have a 5-litre jug and a 3-litre jug. How can you measure exactly 4 litres?

A bag has red, blue, and green balls. How many must you take to guarantee two of the same colour?

You face north. Turn right, turn around, then turn left. Which way are you facing?

Which does not belong: circle, square, banana, triangle?

Which does not belong: dog, cat, chair, rabbit?

Which does not belong: Monday, Friday, Sunday, March?

Which does not belong: red, blue, seven, green?

Which does not belong: apple, pizza, pencil, carrot?

Which does not belong: rain, snow, wind, spoon?

Which does not belong: ruler, pencil, eraser, elephant?

Which does not belong: sun, moon, star, sandwich?

Which does not belong: car, bus, train, tomato?

Which does not belong: piano, guitar, drum, mountain?

A red ball is bigger than a blue ball. A green ball is smaller than the blue ball. Which ball is biggest?

Mia is before Leo. Leo is before Sam. Who is first?

The apple is above the pear. The pear is above the plum. Which fruit is lowest?